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Duramax First Generation: 2001-2004 (LB7) Discuss the first generation (2001-2004 LB7) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 04-25-2019, 11:52 PM   #1 (permalink)
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Looses Prime

Youngest son just came home with 2004 extended cab 4x4 , 6.6 Duramax w/ automatic transmission. Its has cold air intake,new injectors,lift pump, 6"lift lots of extras. The problem is it will not start unless you prime the fuel filter. It runs okay and smooth when it starts but shut it off and try and start it again and it will not start unless you pump the fuel filter primer. Do that and it starts but if not you can crank it for ever.
Only had the truck a few hours just wondering what it may be or where to start isolating issues?
Thank very much for all replies and any advise.

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cold air intake,new injectors,lift pump, 6"lift

Last edited by OkDually; 04-26-2019 at 09:04 AM. Reason: prefix/sig
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Old 04-26-2019, 09:51 AM   #2 (permalink)
dexter
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Fuel filter housing has an internal leak. Get new one at Lincoln Diesel.

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Old 04-26-2019, 04:03 PM   #3 (permalink)
Babin Farms
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^^^Ditto^^^ I tried to rebuild mine with not much luck.
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Old 04-26-2019, 04:21 PM   #4 (permalink)
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Thanks , we actually had an engine light on and it was "air intake feed back circuit" we cleared the code and the starting issue has disappeared . We've stopped and started it 25+ times to see if it was a fluke but so far the engine light has remained off, not reappeared and the truck is starting at the touch of the key each time.It really seems to easy to be true.
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2007.5 , 3500 Sierra SLT crewcab LMM
longbox 4x4 SRW.

2004 extended cab 4x4 , 6.6 Duramax LB7
cold air intake,new injectors,lift pump, 6"lift
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Old 04-29-2019, 11:31 AM   #5 (permalink)
SpikeDmax
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Rebuild the filter head anyways. It's easy and cheap to do and a common wear/leak item.
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Old 06-23-2019, 06:36 PM   #6 (permalink)
MIKAHC38
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I know from your last post it appears your issue is fixed. In addition to what others have posted about the fuel filter head having a leak or crack... but just another FYI on loosing prime from one of my experiences of losing prime... just to put into your knowledge bank... I had to replace fuel hoses that were dry rotted allowing air to suck into the fuel system causing me to lose prime.

I replaced the fuel filter head outlet hose, fuel filter head to FICM hose, and the fuel feed hose. I have had to rebuild the fuel filter head assembly too (about 5 years ago) and so far that has been with good luck.
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Old 07-14-2019, 12:53 AM   #7 (permalink)
dk2429
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get a new filter head... Funny, literally the day after I first got my truck I had the same problem.. LOL. New filter head with the fuel filter and WIF sensor $140 at GM
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Old 07-23-2019, 02:01 AM   #8 (permalink)
jos3ywales
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Mine just did the same thing, new fuel filter fixed it. But from what I understand and I was about to go there was there is some problems with the fuel filter housing. I was about to buy a new one, they say it will fix the losing prime problem.
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