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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

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  #1  
Old 07-17-2011, 06:17 AM
MAXIMUM69 MAXIMUM69 is offline
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Location: Castle Rock, CO
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Default 2004 Duramax LLY Air in Fuel

My '04 Silverado Duramax LLY just broke 100K miles. It has been a great truck, but recently started something that has be a bit confused. When I park it with the front higher than the back, even slightly, it gets air into the fuel system and I have to bleed it at the filter housing to start it. If I park it with the front end lower, it starts right up.

I read several threads here including this one:

http://www.thedieselpageforums.com/t...uel+filter+air

I also took it to a shop that specializes in Duramaxes and he told me the same thing. He said that I could replace the filter housing and all would be cured. But he suggested that I install a FASS auxiliary lift pump and NOT replace the housing. I am reluctant to go blow a bunch of coin without knowing for SURE what the problem is.

Am I on the right track here in terms of the problem and should I replace the housing or just install an auxiliary lift pump?

Thanks in advance for the help....
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Old 07-18-2011, 02:51 PM
Kennedy Kennedy is offline
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I would highly recommend the addition of a lift pump although I prefer a quite different setup than waht was suggested to you. Simple, quiet, efficient Kennedy Twin pump setup. If your filter head is leaking it will then leak externally, but I doubt that it will.
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Old 07-18-2011, 06:43 PM
MAXIMUM69 MAXIMUM69 is offline
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Thanks much - for now it seems to be working. I replaced the filter, WIF sensor, bleed screw and hose clamps. After that, it fired right up, but I just completed it tonight. I like the look of your lift pump, though, and it's priced right.
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Old 07-20-2011, 01:44 PM
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If the problem continues, try loosening the fuel filler cap, then run it loose for a few days to see whether a poorly vented cap might be contributing to the problem. A cap that holds too much vacuum (like after an overnight shutdown) could make a minor air leak in the fuel supply system much worse. An air leak still needs to be eliminated, but....

Jim
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Old 03-01-2014, 04:47 PM
denber denber is offline
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Default 04 6.6 duramax running very poorly and a lot smoke

I have a 2004 6.6 Duramax, LB7,which will barely pull itself. It will not reve over 1800 rpm and there is a lot of light blue almost grey smoke out of the exhaust. On a scope there are no codes and the duration of opening is almost exactly the same for all 8 cylinders. Could alot of air in the fuel cause this problem?
Would love some opinions.

Thanks
Denis
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Old 03-02-2014, 09:00 AM
denber denber is offline
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Default re:04 6.6 duramax running very poorly and alot of smoke

I meant to say no codes and the duration of opening of the injectors is almost exactly the same on all 8 cylinders. The truck has 270k and all 8 injectors were replaced at 200k and then 4 on the left bank were replaced at 243k due to fuel leaking into the crankcase.
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Denis
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Old 03-04-2014, 12:47 PM
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Here's a link to a fairly recent forum thread that discusses how to test for an air leak using a modified cap.

http://www.thedieselpageforums.com/t...ad.php?t=43065

Aside from the modified cap, we've been recommending the same procedure since the 1990s. A tightly wrapped oily rag can be effective to seal the air hose well enough to allow testing.

Jim
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