Fuel pump losing prime overnight Also it does not matter on fuel level. Heres what I did. DOM 10/73. I was poking around up front near the stock fuel filter and there should be some type of transfer pump between the injection pump and the tank, an inline transfer pump most likely but it can also be inside the injection pump. customer also installed an inline pick up pump on the chassis side. Sometimes, not often, once a month or so my truck at start up won't fire, just turns over. It was leaking fuel out of the water sensor so i replaced that and thought i fixed the problem. Have fuel up to the pump but the pump itself keeps draining. I deleted the fuel heater. You'd have a noticeable fuel leak. I think there’s also a check valve built into the fuel pump also. Oct 25, 2013 · My 2000 Escort sedan is having some issues. Went ahead and changed them anyways. Battery voltage is up at 12. 3 idi : It has a new lift pump, new return line kit, new Motorcraft Glow Plugs, and all injectors have been externally cleaned, and all seem to work. Looses prime and hard to start. Your fuel system is losing prime it sounds like. The customer said he spent $8000. It happens when sitting level, does not happen as much when sitting on a slope with the left side lower, I do not keep the fuel tank full, seems to happen less when the tank is more than half full. 3L Power Stroke Diesel - Fuel Leak, Losing Prime Overnight - Over the past few weeks I've noticed a small fuel leak under my truck. The fuel pressure during cranking is over 75. I figure it's losing it's prime and the cranking is necessary to get the fuel back up to the cp3 Oct 16, 2008 · When you turn the key to the on position, I wait until I hear the fuel pump stop pumping, then I try to start the engine. The truck still has the same problem. Which you have already replaced. VIN FM4844 2 filter fuel system. This might be a Mile Nelson question (mopar1973man) if your on Cummins forum. Where you see the bubbles is where you are loosing your prime. Truck started easily as it should have. Jul 6, 2021 · I've developed an issue with my fuel system where it's losing prime. FIXED! Feb 17, 2020 · Hi folks, I have a 95’ f250 7. Finally lifted the bed to find a SEVERELY rusted fuel tank sending unit. Customer: I have a 14-liter engine that loses prime mainly when it sits for six hours or more, like overnight. About a year ago I started having problems with my 06 LBZ losing prime. 2006 int 4300 dt466. Oct 9, 2009 · Either you are losing your prime or when the engine starts it isn't pulling enough vacuum to bring it from the fuel tank to the throttle body, or if the pump is weak from age it can't push it far enough w/o losing prime due to leaks or gas hose has air leaks and it runs back to the gas tank,there are also check valves in the system to prohibit May 13, 2023 · I’ve got a 2006 C15 Acert that is getting air in the system on the suction side before the fuel pump. If you're losing prime overnight, then I'd check every fuel fitting for cleanliness and tightness. Oct 24, 2012 · Fuel pump losing prime The 1973 - 1991 Blazers, Jimmys, and Suburbans Message Board Fuel pump losing prime - The 1947 - Present Chevrolet & GMC Truck Message Board Network Register or Log In To remove these advertisements. If the pump was bad, it wouldn't get better when warm. If these steps do not resolve the issue of losing prime, it's possible that the high pressure fuel pump is defective. There is alot of good advice here, but you also need to consider the o-rings on the fuel injectors. Then let it sit overnight and the pump loses prime and have to go through the whole deal again. Both the check valve and the fuel pump are suppose to hold fuel in the system overnight. I would check the input to the vp44 for a good seal with lines and if you have the pressure sensor right before the vp44 it could be there. Customer: I have a 2019 Cascadia with a DD15 engine that is losing fuel prime overnight. Easiest way to pressurize the tank is by blowing air into it, using a rag wrapped around the blow gun. The excess fuel from the quantity control valve (Y134) and high pressure fuel pump (7) is routed past the 2-stage valve (10). Apr 10, 2023 · Replace Leaking Fuel Injectors: If you suspect that leaking fuel injectors are causing the drop in fuel pressure, you’ll need to replace them. so if its "making its own oil" thats a pretty good indicator. The easy fix is a lift pump or external fuel pump. Reduced flow rate; Increased energy consumption; Damage to impellers, seals, and bearings; Diminished pump efficiency; Increased maintenance and repair costs; It is crucial to prevent losing the prime in pumps. What's happening is after sitting for a while, I lose the prime. Register or Log In To remove these advertisements. Trucks whipping my butt. Have you tried a piece of clear hose between the filter and IP? Or set up a different fuel supply. The 1947 - Present Chevrolet & GMC Jun 24, 2021 · 2017 - 2022 Super Duty - 6. The check valve was also stuck in the fuel tank at the front so we blew some air up there. I also assume I may need to tightent he fuel filter/water seperator. Sep 22, 2013 · Jammer 100's, 63-65-. 3 and it has difficulty starting after sitting out overnight. Jun 9, 2013 · The fuel pump if it is working is not the problem, a loose fuel filter, or a pressure regulator stuck would be my first choice, If the unit has a P7100 pump then when it is running take a pair of pliers and squeeze the fuel return line untill the transfer pump rattles then release it that will flush out anything under the ball and seat. Jun 5, 2012 · You can do this but an electric pump will be required. Should the check valve appear unobstructed, consider detaching the primary fuel supply line and blowing air back towards the tank. 1. Dec 9, 2008 · What are some of the common causes for a 1995 Mack CH to lose its fuel prime overnight? The truck has lots of hours on it (around 20,000+) and ever since the cold weather has hit, the truck will not start in the morning without priming the fuel pump. Now the truck looses prime when shutdown. Paul Apr 14, 2022 · Fuel Pump losing prime The 1967 - 1972 Chevrolet & GMC Pickups Message Board. The pressure side of the fuel system will hold pressure fine. Please provide me with any additional information that could help in troubleshooting this problem. I have replaced the supply line from the tank to the pump. the odd thing is that right before it got hot, it would act like it was running out of fuel and I would have to stop and rev it up to get the fuel going again and oddly enough, the gas Pedal would always get sticky at exactly the same time Apr 26, 2025 · RE: Losing prime overnight/fuel pressure problem (06-25-2024 ) Skman Wrote: (06-25-2024 ) Rawze Wrote: do an injector leak check on it, as per the video, and make sure it passes. I need help, please. When running it runs great and maintains speed to hit 60 Hz for as long as we need Jul 6, 2021 · I've developed an issue with my fuel system where it's losing prime. I guess if the supply and return lines are both in fuel it can hardly lose prime as long as the pump isn't leaking. 6L Duramax diesel. Jun 25, 2021 · Return line overhaul, Fuel pump (mech), new filter. Oct 19, 2006 · I always lose my fuel prime if I let the truck sit for more than a few hours. Oct 27, 2013 · The lift pump is a fairly simple design a rod pushes 1 one way valve that looks something like a piston pushing fuel through the pump a spring returns the valve fillin the cylinder with fuel again. I re-sealed the filter head. Oct 21, 2017 · 2008 Sprinter 2500 170 - camper van. May 26, 2006 · I know the older IDI pumps if the pump lost prime it was due to a worn pump shaft bore in the housing. I'm surprised on a 6400 they haven't already been replaced. If it sits overnight, it takes about 5-7 seconds to start. It's also advisable to inspect the vent tubes on the tank. How I came to that conclusion I changed the pump filled the fuel filter mechanically by pump shut the truck off let it sit all nite and in the morning the fuel filter was still half full. Any ideas or suggestions would be appreciated thanks for your time in advance. Jun 27, 2015 · A quick bleed and a couple dozen pumps and it will start right up and run fine. Effects Of Losing Prime In Pumps. Apr 9, 2014 · have same problem with my 6620, will lose prime overnight but only when the fuel tank is low, i have replaced all the fuel hoses i can get at and it is a bit better. The tractor will start all day but lose prime overnight. if all else fails try a fuel pump check valve, napa used to sell em but discontinued them for some stupid reason. 3. 3L IDI Non Turbo Diesel Trucks Oct 10, 2012 · I agree with above posts. Jan 20, 2018 · I have an 05 with similar overnight prime loss. I've also not noticed any fuel leaks. 6l LLY 10mm fuel pump, Stage one injectors, Stage 5 PPE trans, Factory turbo, DSP-5 switch, CTS3 Insight monitor, Airdog FP1004G Lift pump Oct 26, 2010 · I would replace those three line sections, (separator to lift pump and lift pump to fuel filter and fuel filter to injection pump). Was wondering if anyone else has experienced this. Old lift pumps can leak; if you've got a leaking lift pump, replace it. ‪ Feb 2, 2020 · Still loosing prime. 7 liter series 60 Detroit engine (500hp). Replace the Fuel Pump: If the fuel pump is faulty, you’ll need to replace it. Sep 1, 2018 · My 2003 GMC duramax loses prime sitting overnight and sometimes in a few hrs. 5 - 1997 7. 0 but ive Jun 25, 2021 · Return line overhaul, Fuel pump (mech), new filter. Feb 1, 2019 · I removed the fuel line from the suction side of the FASS pump at the fuel inlet to the pump and there was no fuel in the hose. Apr 6, 2016 · I bought a new fuel pump and put it on. This usually takes 5 mins or so of bleeding and turning the key on and off and letting the lift pump run. Replaced the intank lift pump. My truck is a 2006. Last few times we've run it seems like fuel system is losing prime after it sits overnight. The o2 codes can be caused by too high of fuel pressure or too low of fuel pressure. It then passes into the fuel line to the filter through another one way valve which is what went bad on mine May 26, 2017 · 1994. If I towed a while and then stopped for fuel or what not, it wouldn't restart. Mar 30, 2014 · I run a 2011 Cascadia with a dd15. Then I will have to bleed the fuel filter and bump the starter to allow the lift fuel pump to reprime. Borrowed the MV (Mityvac) again and verified the filter holds vacuum with no lines attached and filter empty, ok. Back story is I drove it about 250 miles, when I shut it off it sat about an Hr. I replaced the injectors, washers, and return line washers. It started out the truck would lose prime overnight now it is only taking an hour for it to happen. It started getting really bad about 4 months ago. The first is the check valve. Help Nov 25, 2015 · Fuel is meant to drain back to the tank its the way it is designed to work the fuel gets siphoned back thru the return line when the truck isnt running hence the fact it looses prime . 2. I also replaced the fuel pump, and now I'm scratching my head. Feb 22, 2024 · The truck spinning over turns 90 rpm’s nothing more. You will have about $3-400 in a diy setup, but the benifits far outway the initial cost. High pressure lines and seal from pump, blocked off return and left over night still have the same starting issue. Oct 21, 2019 · If it's still losing prime I will replace the lines and the fuel pump. Sep 30, 2011 · 03 with 190k miles and new injectors. Is this a common fuel pump May 24, 1998 · If I let my truck set for more that about 8 hours it seems to lose prime. any carter/eddy setup i have had my hands on with a mechanical fuel pump will need some cranking to refill the carb after the fuel has evaporated after a few days of sitting. Air bubbles can disrupt the fuel flow and prevent the pump from maintaining its prime. I changes the fuel pump and still have the same problem. He changed the glow plugs and the glow plug relay, which helped, but the fuel seems to be siphoning back into the tank overnight. I need help with this. Aug 8, 2024 · Causes of Fuel Pump Prime Loss. I have an aftermarket H&S lift pump and I can hear the pump coming on but it takes anywhere from 2 Jul 7, 2007 · I have a 02, 2500 HD, Duramax engine that is losing prime. Leaks on the pump’s intake line as well as around the shaft seal of the pump housing itself can cause your Apr 25, 2024 · But when I was towing, especially on the hwy, I would have problems. You can press the plunger crack the bleeder screw to get the air out and it'll be firm for about 3 seconds then it's soft again. Last week all of a sudden my fuel system lost pressure overnight. I changed the vacuum sensor and put a new fuel filter on it but the problem persist. Seems like a low fuel pressure issue — regardless of tank selection, if I prime the system (turn key 4x to pos 2/wait to start, wait 15 sec per fuel pump prime) it fires right up. Aug 29, 2021 · Most times it means the check valve in the fuel pump is failing. I went to his house, and changed the fuel pump in his gravel drive. The fuel system is losing its prime overnight causing hard starts the next day. It may run like that for years, or fail tomorrow. Apr 22, 2010 · 1999 - 2003 7. Overnight the pump will drain into the tank. Faulty Check Valve Oct 31, 2024 · Also if I just leave my key on, to let the lift pump pump some fuel it typically works just fine. Any suggestions? Oct 24, 2011 · 3. Dec 10, 2017 · It seems like after several days it should at least fire and stumble from pumping the throttle and fuel coming from the accelerator pump, but its just dead and cranks and cranks. I have replace both rubber fuel lines coming from the fuel filter. Possible you have a bad injector o-ring. Jul 14, 2014 · 2011 LML 82k, The truck takes a little more cranking to start. My mechanic went through fuel system found a few possible leaks, tightened them up but it's still doing it. If it ran yesterday, it cranks right up, but after two or three days, it's painful. pyro & boost gauges fuel cooler BHAF, Black Holley lift pump-12psi WOT Ceramic/Kevlar SD clutch, studs Take time to turn-so you don't burn Nov 25, 2015 · I have to crank and crank and crank, and lately, it's easier to just stuff an air hose down the fuel filler to force prime it. It seems as if the fuel is not maintaining pressure while sitting overnight. It still does it!!!! I can choke it and work the pedal and then eventually it will start to pump fuel after a few minutes. transfer pump and check valve at the back of the head have been replaced. Dec 11, 2010 · My truck loses prime after i let it sit on a grade for longer then 2 days, if its on flat ground, or only sits overnight or a day then it starts right up. If car sits overnight, i blip throttle and it fires right up. Played the game for over a year with filter "o" rings injector pump and various "ideas" none of which worked for very long. After a recent trip, the truck started to lose prime. I checked the fuel primer pump and it was soft, so I pumped it up ( I was in the desert 112*) I thought maybe a heat issue. For some reason John Deere uses some kind of fiber lines on those tractors and as they age they get so they leak enough for air to get into the system if they set awhile (like overnight), then you have to run the starter enough to purge th air before it will start. No difference. I'm thinking maybe i have a leak at the fuel filter head, or the plastic bleeder screw. 2005 Chevrolet Silverado 2500hd 6. Car won't start after much cranking, can pump throttle and get no gas from the accelorator pump. Found could not attain and hold fuel pressure above 21k psi. Nov 2, 2008 · So I have a 2004 Jetta TDI. If you have good power under load, I would just install an electric fuel pump for priming before starting truck, similar to a cummins with electric lift pump but you can get one and install inline anywhere, almost. Can I successfully troubleshoot this without all Detroit testing tools ? There are two things that cause the engine to lose its prime. I can drive it for a long time, turn it off, and it starts right back up. Thanks again, I will keep posted on what I find. Don't rule injectors out unless you have a natually aspirated engine. I'm losing pressure somewhere. After 6-10 pumps its firm and she fires right up Jul 14, 2016 · Ok guys I need some help. Well until I reseal my extra pump I sprung for a $45 low pressure pump to keep fuel going to the pump so I dont have to pull off the lines and prime it every 3 hours. you could try buying an electric inline tranfer pump and installing it between the filter and the tank. Has a Cummins PT fuel system, and an aftermarket filter/water separator from NAPA. 6 days ago · RE: Losing prime overnight/fuel pressure problem (06-25-2024 ) Skman Wrote: (06-25-2024 ) Rawze Wrote: do an injector leak check on it, as per the video, and make sure it passes. when I went to restart it fired and ran about 30 seconds and died. The truck always fires up fine but starts to miss and die after 30 seconds or so. The truck will crank and crank if I let it and will eventually start. my rail pressure is somewhat low, but overall performance and fuel mileage is still as good as ever. Mechanic at my own shop Mar 28, 2011 · Back in the driveway and see if you have fuel in the upper filter after it sits. Each time it finally starts after I pump the gas and hold it to the floor but it takes like 5 attempts before it fires. I did verify that fuel pump is doing its 2 second prime when the ignition key is turned to the ON position. I have replace the water sensor at the bottom of the fuel filter. This valve not only regulates fuel pressure to the Injector Pump, but in theory should hold fuel in the Injector Pump when the engine is off. I replaced the return line from the injector pump to the filter with a clear hose and see bubbles. Jun 22, 2006 · I am losing prime overnight and have extended initial crank times now. Customer: i have a d13 that looses fuel prime overnight, thinking may be a check valve? Mechanic's Assistant: What's the make/model/year of your truck? Engine type? Customer: 2014 volvo sn:en153361 engine d13h425 sn:383512 Mechanic's Assistant: Are you fixing your truck yourself? What have you tried so far? This one has the electric pump in the housing oil side, and everything is within specifications; however, it keeps losing the prime. I have to reprime the fuel system every time after letting it sit for a few hours. 9 with an edge and Airaid Intake. Oct 6, 2020 · Does the hand prime pump on a Cat engine have check valves that could fail and allow the fuel to flow back to the tank? The reason I ask is: I pulled my 2000 CC Magna with C10 out of my shop and C10 Fuel system lost prime - iRV2 Forums Jun 22, 2009 · My current injection pump is leaking slightly and losing prime overnight. Dec 26, 2011 · We did a write up in Diesel World about this problem a few months ago. Once I put a lift pump on, that problem went away. I have a 2013 Freightliner Cascadia DD15, and it keeps losing fuel prime. That didn't fix the problem. It's cheap, and then you don't have to worry about leaking diesel into the engine or it failing randomly. Put new pump on with new rubber orings on the fuel lines and no change, still dies. I have checked, and checked, and double checked for leaks and I can't seem to find any. I have replace the fuel filter twice, once with an after-market and now back to the OEM filter. The guy I bought it from said it loses prime if sits for a while, and he was correct. Possible areas are loose hose clamps, or even a cracked line, that stupid tee which sounds like you changed already. If you have a leak, you should start seeing fuel dripping out somewhere. I Losing fuel prime when set overnight. When it’s bad, it drains into the return. Am I fixing my truck myself? There are several things you can do to find what might be causing your pump to lose its prime: Steps To take If Your Pump Is Losing Its Prime. As soon as I turn the key off, the fuel drains out of the bowl followed by a weak hissing sound like it’s sucking air after all the fuel is out of the bowl. The fuel system loses pressure with the truck off. When I go inside to pay and come back, there's no prime. Mar 28, 2012 · If you're sure that you're losing prime then air is getting in somewhere and allowing the fuel to go back to the tank. If you still have trouble, replace the line from the lift pump to the fuel filter head with a piece of rubber hose and a squeeze-bulb primer. This puzzled me because the fuel line comes from the top of the fuel tank and drops down to the fuel supply inlet to the pump. It started when the truck sat overnight, now the issue starts earlier, even as much as 4 hours. It may build pressure, but if it can't flow enough enough volume, the pressure will drop. Put 10 PSI on the system and crawl all over the truck and look for seeping fuel or air. I've got an Edelbrock 1403 on a 289 with a stock Carter fuel pump. Jul 16, 2013 · To rule out the possibility of a leak in the fuel line(s) or connections, I ran a direct 3/8 inch fuel line from the tank to the pump and another one from the pump to the fuel bowl. My belief is that the fuel pump was allowing the fuel to drain back. If it sits for 10 or 20 minutes it starts right up. Mar 18, 2023 · Hey, Mike here with a 2013 lml duramax losing prime. I would have to crank for 30 seconds or so, and then she Jun 25, 2009 · your "check valve" in the fuel pump assembly in the tank is failing. Fuel pump was spitting out the "weep hole". It has front and rear fuel tanks and both have plenty of fuel, and it loses prime under either one. I prime truck up with primer pump and just flows back into the tanks not priming the motor. Jan 15, 2009 · One way to check for leaks is to take a compressor, set it 5 psi, no more, stuff a rag in the fuel inlet and start the air. There is a diaphram inside the injection pump that can crack. Runs good when it's running, have been hand pumping it and loosening an injector to get it going. 70A/R WG, adj. As a side note, last summer this machine would get hot when I work it real hard, but I am in the desert. It is common for the fuel lines to go bad in these trucks. The other is the fuel transfer pump on the engine. boost elbow Big Line, fuel press. Check the line at the lift pump, it is holding fuel. Nov 27, 2016 · The poster claimed that he had been taught to always check the return side first when losing prime on fuel systems. Jun 21, 2013 · 2001 2500HD Sierra w/6. a $450 fuel lift pump. let unit sit overnight and it will lose prime again. A description of the fuel system is as follows. 50 to 75 psi should be about right remember to put a inline filter before Oct 21, 2017 · 2008 Sprinter 2500 170 - camper van. Feb 6, 2017 · The fuel system has been replaced with the injectors due to metal in the fuel system. If i park on a slope with the nose down, it usually will start without pumping the primer on the fuel head. Step one go to your local autoparts store and purchase a low pressure fuel pump. 3). This morning, no prime. The problem is that it is loosing prime when sitting overnight and is hard to start. Check for leaks- 90% of all pump problems occur on the suction (or Intake) side of the pump. 2016 dd13 lost fuel prime, 2016 detroit in a western dd13, everthing it seems when u presure the test port the fuel just Jeremy | ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications Mar 6, 2015 · I am apparently losing prime when sitting. Then with the separator valve closed and the line removed from the input of the injection pump, use air about 5PSI on the output line of the fuel filter, check for leaks. I give it a little manual prime (gas in top of carb) and it fires and runs fine and accelorator pump works correctly. Replaced fuel injection pump - could attain full fuel rail pressure but still loose prime over time and hard start. Truck has been sitting for almost three hours now. It was running smoothly UNTIL I hooked it to a large RV. Unless you have a cracked filter cap or bad line, the fuel system to the upper filter will purge when the truck gets turned on, and the fuel pump runs. Uhnope! Still have the issue. Nov 7, 2019 · Cummins NT-855 PG270. will the motus do the job or should i go with the ae i work on all kinds of gas engines so i know i can do the work myself im not afraid of it id like to think of myself as gifted with a wrench i just am not to smart on these old 6. Anything else I can try before Jan 13, 2024 · Then about 3 weeks ago started smelling fuel going down the road; upon first inspections I replaced the rubber fuel line from frame to fuel pumpnope. All you need is a minor split in a line or a speck of crap on an O ring. I would change it next. Jul 25, 2020 · Ive replaced the fuel line coming from the fuel filter to the injector pump thinking it was leaking there, but that was not the case. you can either remove the entire fuel pump assembly and replace (in the xj the fuel tank does NOT need to be dropped to do this) or buy a in-line check valve from a parts store. No change. Time for a check valve! even added an electric pump before the mech which helps with starting (filling the filter) and now I get a FUEL FILTER light on the dash if I run without the electric. This is a 94 Mack with I think a 400,but not sure without checking. My first thought was fuel pump bad from setting all those years. I have cycled the key several times to try to get fuel moving but still doesn't start. May 13, 2023 · I’ve got a 2006 C15 Acert that is getting air in the system on the suction side before the fuel pump. What could be the possible causes and common issues related to this? Aug 17, 2019 · Before I did the cups, the truck would start every time no problem, tried for 3 days. Apr 10, 2022 · Check valve holds fuel in the head. It will start up and run for about 5 secs and then die. I have a Freightliner 2014 Cascadia DD15. 7 PSD won't hold fuel prime - Having a weird issue with my 2022 F350 6. Well, it got to the point it would die but hold the throttle open and it fire back up. Apr 10, 2020 · I've done probably the same amount of bleeding fuel lines as most cruisers, but am no expert. Could it be the primer unit, injector seals, re The info is hit and miss, but post VP44 inlet port there's a check valve to keep fuel in the pump/injector circuit. Sometimes this happens overnight, and other times it occurs when the diesel is filled. 9L) - Hard start - losing prime? - Hi all, I have a 1990 F250 7. The problem would come and go. I probably should just do the whole thing, IP, new everything and be done with it, but that's expensive for me right now. And run fine after the pump gets primed. The fact that it runs briefly suggests to me that you're getting fuel at least to the injector pump. DPE73120 Injector Installation Kit for 1990 - 1994 Ford 7. Quite a few folks are turning truck on, without starting, several times, in an effort to ?prime? the system before starting truck, similar to old school (love my 7. So I'm guessing it was evaporating/leaking out the diaphragm inside the fuel pump on a super small level for some time and then "gave up the ghost. It was performed by another shop. I learned two things. I've been working alot and haven't had time to get into it really yet. 7 PSD. Didn't have to let air out, just pump the pump. Put fuel in the tanks, it didn’t have this issue before the cam housing. I dont know if that might be causing fuel to push to the injector pump continually or a issue somewhere else. Retest. Sep 10, 2016 · Hey guys! I have been losing my mind over this one. 3 non powerstroke. When there is an air leak, air leaks into the fuel system before the Injector Pump and almost always before the Lift Pump. Fuel System Leaks. also if your airdog is mounted Customer: My 2014 Freightliner DD15 keeps losing prime after I installed a new pump back in October 2020. Also put a non return valve in the line as close to the fuel tank as possible The high pressure fuel pump (7) pressurizes the fuel up to 900 bar (13,053 psi) and is then fed to the fuel rail (8). Replaced sending unit, fuel cooler, and lines to underneath front door. Nov 14, 2018 · The fuel pump is getting fuel to the secondary filter bowl and it will overflow all over the place if I leave the key on with the cap off. Jan 1, 2012 · Could be anything really,first start simple look for fuel leaks on the engine itself,head jumper tubes and psi lines from pump to rear of rear head and front of front head,then I would check for air in the fuel system with either a glass sight glass or go to the harware store and buy a 4-8 inch chunk of 5/8 clear nylon tube,put #10 ends on it Jul 7, 2010 · They're as cheap as $30 on ebay. Together, we will work to diagnose and resolve this issue efficiently. I replaced return lines, caps, and fuel filter. 3L IDI & 6. Is there any way the return line is the Nov 26, 2021 · 2017 - 2022 Super Duty - 2022 F350 6. Jun 28, 2009 · The truck is a 98 Western Star with a 12. There are two things that cause the engine to lose its prime. You most cost effective route for the long run would be to convert to e-fuel. Losing prime in a pump means the air enters the pump casing while the pump is not in operation. It may take two people. I finally had enough and rebuilt the filter head with new gaskets AND installed the Nov 3, 2012 · Ive also seen fuel pumps leak into the crankcase or vent hole on the side of the pump body as well, losing prime. The fuel tube out of the tank goes under the cab to a rectangular block. May 4, 2017 · It started acting like it was running out of fuel when you first started it then it would pick up and run fine. Drew Mar 6, 2009 · Fuel pump losing prime overnight? The longer my 1996 Dodge Ram 2500 Diesel sits, the longer I have to crank the - Dodge 1996 Ram 3500 Club Cab question Nov 13, 2010 · I have an 05 5. The problem with the truck in the article was the fuel injection pump. It doesn't start in 3 seconds, so I let go of the key, let the fuel pump stop again, then the engine starts right up. 3L Power Stroke Diesel - Loss of fuel in system after sitting - Okay, I figured out that my truck looses the prime on the fuel system if it sits overnight. Runs and drives fine Feb 17, 2008 · My experience is this, I bought my 6. Will prime the system quick. 2 injectors recently replaced by another shop, now replaced non return valve, fittings at rear of head, and PLV. I'd have to pump the hand pump on the filter head and then it was fine till the next time I stopped. I replaced the seals in the filter head and it worked great for 3 days , so i thought that was the problem, but then it was back to the same old thing. I replaced the fuel pump, since the stealer said that was the problem. No change, all check valves work, swapped two stage valve in pump, it’s a Gen 1 two filter housing. Hope helps. I have to go under the hood and pump up my diesel fuel system - located on the passenger side of the engine. The truck has push button start and if I leave it sit for a day or so, it seems to lose its fuel prime. 9 from a guy that didn't want to fix it. Increased fuel pressure, more consistent fuel pressure, smoother idle, better throttle response. After sitting overnight I get in to start and it just turns over but no fire. no signs of external fuel leaks. The excess fuel is then routed to the fuel accumulator (14). The so called check valves in in the transfer pump arent to hold the fuel up to the motor they are just to supply fuel when running . I started the engine, it idled fine for a minute, the knocking sound came back and even stronger, and the engine stalled. Can I successfully troubleshoot this without all Detroit testing tools ? Jan 7, 2014 · Needs new rubber fuel lines. you can to the downhill parking as well as wipe all fuel lines down and start the truck and look for leaks which you probably have already tried. I have to turn the key on and off 4 or 5 time to get the fuel up to the injectors to start. I thought it was my fass filters on my lift pump so I changed them, was fine for a few days but then It started losing prime again. This is a job that’s best left to a professional mechanic, as it requires specialized tools and knowledge. I would try and start, and she would turn over, catch, and then stall. Feb 12, 2013 · I believe that the fuel system is losing prime. May 19, 2020 · The fuel primer /filter seems to lose prime after sitting about an hr or so. 8 while cranking. It Mar 21, 2016 · 2. Oct 19, 2007 · If I immediately shut it down and then restart, it starts up and fires in the usual 1 second of cranking. I'd been reading about how the only way to effectively chase a fuel leak is Customer: I have been losing prime from the fuel pump. Now I'm getting scared it may not start at all. Sit for more than a few hours and it doesn't want to start. It does it full or empty. If I turn the key from off to on (but not start) about four to six times, I can HEAR the fuel pump pressuring my system. Swapped housing and injection pump, PLV in fuel rail. Jun 20, 2012 · So the situation of extended cranking to fire has been getting steadily worse. It Customer: 2013 Western Star DD16 losing fuel prime, rail pressure drops to 16psi in minutes after shutdown. I don't have any air in the system, and the lift pump will fill the filter housing completely with the key on and the filter removed. Several factors can contribute to a fuel pump losing its prime: 1. Dec 14, 2020 · Sometimes with a Holley, you can get the engine to sputter long enough while cranking on just a few acc pump shots for the fuel pump to fill the bowl. 7L Fuel System Priming - Saw on multiple threads that there is a potential issue with the Bosch CP4 fuel pump. Added a check valve to return line before thermostatic tee. Solution. If it's still losing prime I will probably then tear the IP out for service. It will still start, but it takes a while. . My feeling is the fuel pump lets pressure off and loses prime? 2. I will go out in a couple hours and see if it takes overnight or if it will do in a few hours. Once it finally starts, then it is fine. typical symptoms are extended cranking times after sitting overnight. After it sits for longer than an hour, it cranks over for about 8 seconds before it fires up. 3l IDI, (4x4 Supercab longbed). The only thing he didn't do when he serviced it was the fuel filter. Oct 5, 2012 · There is so many places you could have a air leak, Fuel head,lift pump,Duel tank switch(O rings),At the fuel tank (O rings),Return line O rings,Dry rot fuel lines etcId say just start at the oldest part and work from there, I got mine from the Diesel store. 5 and drops at the starter to 7. I am assuming I need to check the return line that goes from the back side of the engine to the tank. It has the three filter system on it and sitting here has no fuel in filter base. Aug 1, 2009 · I pressurize my fuel tank with shop air starting in 5 psi increments up 30 psi coating the lines, connections and pumps ( lift and HP injection ) with leak check ( a soap solution ) and go hunting. Its still losing prime over night though, once you get it primed it will start up and run great all day long, let it sit overnight and same thing again. You also have to remeber that pressure does not equal flow. im sure theyre available from other vendors. Nov 26, 2021 · 2017 - 2022 Super Duty - 2022 F350 6. Pull the pump first, before you buy a new one, there are two different styles of mechanical fuel pump arms, and I didn't feel comfortable putting the odd shaped one in, just in Hello, I understand your concern about your Freightliner truck with a Mercedes engine losing prime overnight. When the fuel leaks down. It seems to me that it is losing prime. Not enough to really affect my MPG much, but I want to get it dealt with before it gets worse. Oct 10, 2010 · thanks man i have a snap on scanner now but i will get a autoenginiuty or maybe trade my older scanner in on a motus but i own all ford products anyhow. Leaks in the fuel lines, fuel tank, or fuel pump itself can allow air to enter the system. koeo, inline pump runs and fuel present through all engine fuel lines and out the return at the back of the head. Primed it with hand primer, started right up and ran fine. Jul 27, 2017 · 1991 F350 7. Dec 16, 2011 · Acts like it's losing it's prime; after sitting for several hours it needs about 30-40 seconds of cranking to start, warm or cold. Just rebuild the VE last night. 3, V8 325,000 miles, leaks oil now at rear main seal stock 4L60E on 5th filter/fluid change; 2nd set of drive shaft u-joints; rear diff new bearings; 2nd fuel pump and fpr; ABS pump circuit solder reflowed; 5th water pump; 2nd fan clutch; new front wheel bearing units; new front and rear shocks; 1000# rear air springs, Brake fluid Apr 9, 2023 · Problem solved. Last time I started it, I Jun 9, 2014 · I replaced the rubber fuel lines, injection pump, and lift pump. Aug 16, 2009 · Pre-Power Stroke Diesel (7. But then, I'm not an expert, only tossing out what I read from a credible poster. - No fix 4. I've replaced the check valve, fixed a leaking fuel line, changed the manual shut-off valve, and my injectors are only a couple of years old. 2001 Suburban LT 2WD, 5. I have replaced all fuel lines to and from the pump to troubleshoot, no change. Mar 13, 2009 · Pump timing doesn't go bad overnight, it takes years and years and it never gets that bad it wont run right. Again, this Feb 4, 2013 · (ALWAYS remember this side of the fuel system in under a vaccum) - From the transfer pump to the secondary filter then finally fuel is fed to the injection pump thru the special hose 688190C1 to the Model 100 (ALWAYS remember after the fuel leaves the transfer pump it is under pressure) if fuel is bleeding down suspect a leak on the vaccum side Nov 7, 2009 · I just purchased a 1993 Ford f250 with the 7. It’s fine during the day but loses prime overnight. Feb 21, 2010 · My 65' looses carb prime after sitting a week. Somehow if the truck sits 10 hours or more, the fuel system drains back to the tank and I have to pull a slug of air through the entire system each Jun 2, 2011 · Prime it up, then pressurize it, the leak is most likely small enough that you will not notice a pressure drop. May 26, 2008 · Can the hand primer work ok and the fuel pump be bad? Is there a check valve in the system besides in the pump that would allow it to lose prime. gvcunk lmfbdu epo bsnvhlvg jcmb acqec hzt evjycl nyiad gqiqrpv