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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 04-13-2011, 11:56 AM   #1 (permalink)
gecsr1
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Hard Start when engine warm

Hello, LB7 03
I have been experiencing hard start , most of the time it's when the motor is warm, once in a while it will crank more than usual when cold before starting.

I have no smoke, no loss of power and the truck has only 51000 miles.

I have replaced the bleeder screw as well, I noticed theyhave rebuild kits for the filter housing . Could the filter housing be the problem?

Only once it refused to start at a fuel station after towing my 5th wheel 150 miles. ( used starting fluid to get it to go) I was told not to that any more and if I did use wd40 so I was warned .

I see no leaks anywhere, and sometimes it starts just fine and other times it don't.. so my thoughts are it's in the filter housing ? where it may be sucking air.
Thanks in adance

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Old 04-13-2011, 04:38 PM   #2 (permalink)
gecsr1
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bump

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Old 04-13-2011, 04:48 PM   #3 (permalink)
Tanc Crusher
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Most likely you will not see any leaks since from the tank through the filter to the CP3 pump the fuel system is in a vaccum state when running or atmosphere when off. To look for a leak get a fuel cap from the auto parts store. install and air fitting into it and pressurize the fuel system to 10 psi and start from the fuel tank up to the CP3 looking for leaks. Being as old as it is and maybe the type of enviroment it is in the lines off the fuel tank are know to crack and start leaking there.

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Old 04-13-2011, 05:14 PM   #4 (permalink)
blkdmax05
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If you prime it does it start right up?
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Old 04-13-2011, 06:36 PM   #5 (permalink)
gecsr1
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Quote:
Originally Posted by blkdmax05 View Post
If you prime it does it start right up?

Okay went and pumped it up 4/5 pumps till hard, started right up (cranked over 4/5 times.
I let it warm up and I try it in 20 mins, I 'll pump it up again before I do

Gary
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Old 04-13-2011, 07:22 PM   #6 (permalink)
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If it starts again after priming you have an air leak in the fuel system. If it warms up and has trouble starting, could be CP3/injector issues
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Old 04-13-2011, 08:22 PM   #7 (permalink)
gecsr1
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Pumped it up again after letting it set 20 mim, and it started right up...
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Old 04-13-2011, 08:23 PM   #8 (permalink)
gecsr1
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I guess I'll start looking for a leak....
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Old 04-13-2011, 08:48 PM   #9 (permalink)
blkdmax05
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Good luck, best thing to do is as Tanc listed above with the cheap fuel cap. Usually leaks are around the filter head somewhere. We have all been there, I know I have
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Old 04-18-2011, 01:03 PM   #10 (permalink)
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Yeah, I would start with the filter head, when you prime it do you notice any leaking on top of the filter housing? That is where mine is leaking right now. In the winter it does not leak (as much) and starts fine, not great but fine, and in the summer it takes a while and sometimes I have to prime it to get it to start. Mine started late last summer and got better over the winter, so I forgot about it, now that it is warming up I am noticing longer start times, need to get the parts....

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