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Duramax Second Generation: 2004.5-2005 (LLY) Discuss the second generation (2004.5-2005 LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion belongs in Third Generation forum due to the differences of the 2006 LLY and the 2004.5-2005 LLY. Engine related discussion ONLY.

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Old 01-11-2017, 01:58 PM   #1 (permalink)
brossmobile
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fuel issue STUMPED

Hey everyone, new here,thanks for the add, hope someone can help me. Here's the story. Customer has a 2005 Chevy C5500. They left it parked in -20's for a few days not plugged in and tried to get it going Sunday and killed the batteries. Tried to start it on site Monday, no luck, towed to our shop and let it sit inside to thaw out. Charged batteries and could get it to start when primed but stalls as soon as I quit priming. Replaced fuel filter, replaced WFI sensor, bought and installed the fuel filter housing rebuild kit, still no luck. Tried to draw fuel straight from a can into the filter housing, no change. Pressured the fuel tank and could not find any air or fuel coming out anywhere. I am stumped, any ideas where to go from here???? Customer said it was running fine when he parked it. It only has 76430 kms on it. Thanks for listening guys!!!

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Old 01-11-2017, 02:23 PM   #2 (permalink)
brossmobile
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I just tried an electric fuel pump from a jerry can directly to the fuel filter housing, still only runs when primer button is being pushed.

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Old 01-11-2017, 04:13 PM   #3 (permalink)
dmax3500
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primer head still leaks?
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Old 01-11-2017, 06:12 PM   #4 (permalink)
Ron Nielson
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With your fuel pump supplying fuel, you did crack open the bleeder to remove air from the filter?? Just checking because that's exactly the result I get when I fail to bleed the air from the filter. Once you have a steady stream, it runs forever.
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Old 01-12-2017, 06:59 AM   #5 (permalink)
MANICK
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If you're still fighting it, describe your process you used to bleed the system after the new fuel filter. If you got it straightened out please fill us in on what you found.
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Old 01-12-2017, 08:00 AM   #6 (permalink)
brossmobile
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Hey guys, going back to it this morning. I took out the bleeder screw until I had steady fuel and primed it until the primer was rock hard. This all started way before the fuel filter was changed, nothing I have done has made any difference. What kind of vacuum should I have?
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Old 01-12-2017, 08:08 AM   #7 (permalink)
brossmobile
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Or could there be a check valve in the system somewhere not doing its things or something on the return side??? I am pretty new to these so I am lost right now lol.
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Old 01-12-2017, 08:46 AM   #8 (permalink)
Ramblinrodney
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How full is your fuel tank? Sometimes it's ended up being a plugged up pick-up in the tank or pick-up in tank cracked
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Old 01-12-2017, 09:00 AM   #9 (permalink)
brossmobile
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Tank has at least 100 litres in it. It the pick up was broke or plugged how can I still prime the system with the primer? Does make sense though.
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Old 01-12-2017, 09:10 AM   #10 (permalink)
brossmobile
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I had the lines off at the filter so I just blew a little air in the line and could here it bubbling in the tank, shouldn't be plugged but, shouldn't there be a check valve or something in there to stop the fuel from running back to the tank from the filter housing??

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