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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 01-20-2020, 01:42 PM   #1 (permalink)
DMAXFRANK
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Engine Quits after starting

After my 02 Dmax sits overnite it will not start until I prime the fuel filter by pumping up the knob on top of the fuel filter.is there an anti drain back valve in the filter that may be causing this. Has any one else had this problem and what caused it.

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Last edited by OkDually; 01-20-2020 at 02:23 PM. Reason: prefix/sig
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Old 01-20-2020, 02:17 PM   #2 (permalink)
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Quote:
Originally Posted by DMAXFRANK View Post
After my 02 Dmax sits overnite it will not start until I prime the fuel filter by pumping up the knob on top of the fuel filter.is there an anti drain back valve in the filter that may be causing this. Has any one else had this problem and what caused it.
Welcome to DieselPlace

It's time to rebuild or replace your filter head.
The Orings inside of the primer will breakdown over time and allow air to enter the fuel system.

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Old 01-20-2020, 03:35 PM   #3 (permalink)
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Quote:
Originally Posted by DMAXFRANK View Post
After my 02 Dmax sits overnite it will not start until I prime the fuel filter by pumping up the knob on top of the fuel filter.is there an anti drain back valve in the filter that may be causing this. Has any one else had this problem and what caused it.

Tech Tip: http://www.kennedydiesel.com/docs/Du...ift%20pump.pdf
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Old 01-21-2020, 07:44 AM   #4 (permalink)
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Quote:
Originally Posted by OkDually View Post
Welcome to DieselPlace

It's time to rebuild or replace your filter head.
The Orings inside of the primer will breakdown over time and allow air to enter the fuel system.
^^^^
http://www.kennedydiesel.com/docs/Du...ift%20pump.pdf
^^^^

Last edited by Rvn4me; 01-21-2020 at 07:47 AM.
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Old 01-21-2020, 07:59 AM   #5 (permalink)
DMAXFRANK
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Thanks everyone for the quick replies, I found out that the filter head repair kit is available locally and will get it installed ASAP. Will let you know if this corrects the problem.
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Old 01-21-2020, 10:55 AM   #6 (permalink)
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Check all your hoses and lines too for leaks. Some of them can suck air without leaking noticeable fuel. Found that out the hard way.
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Old 01-21-2020, 10:57 AM   #7 (permalink)
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OK Rick will do,thanks.
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Old 01-22-2020, 08:21 AM   #8 (permalink)
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Originally Posted by RickDLance View Post
Check all your hoses and lines too for leaks. Some of them can suck air without leaking noticeable fuel. Found that out the hard way.
If you haven’t bought it yet here it is or buy locally. You can install it yourself and save $$$
Watch the video
https://www.merchant-automotive.com/...build-Kit.aspx

Last edited by Rvn4me; 01-22-2020 at 08:21 AM.
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Old 02-03-2020, 02:20 PM   #9 (permalink)
DMAXFRANK
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Well I took it in to get the filter kit installed, when we looked at the filter and tried to remove it the filter was not really as tight as it should have been. Decided to just change the filter and see if that fixed the problem. That filter had been on the truck for 7 months and always worked OK but so far after changing just the filter truck starts good and runs fine. Going to let the truck sit for 4 or 5 days and see if it still starts OK. Will let you all know what happens.
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Old 02-08-2020, 11:15 AM   #10 (permalink)
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did the truck start after sitting?

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