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Old 12-31-2012, 02:37 AM   #1 (permalink)
hhorawa86
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Annoyed!!! Starting problem!!!

Ok my 04.5 LLY runs amazing and gives me only one lil problem!!! Ok it's been pretty cold lately so I usually plug it in and it starts and runs fine... However if I don't plug it in it will start on the first crank and run fine for less than a minute and die... So I have to get out and pump the plunger on the fuel filter til it gets hard... Sometimes it starts after the first pumping process sometimes it takes 2 or 3 tries... Can anyone tell me how to fix this or wat to check???
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Old 12-31-2012, 02:46 AM   #2 (permalink)
Kappa9012
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have you replaced your fuel filter lately?


Someone else chime in here, but when does the little heater in the top of the filter housing kick on?
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Old 12-31-2012, 02:56 AM   #3 (permalink)
hhorawa86
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Yes

Yes I replaced the fuel filter about 3 months ago... Is there something besides just taking the old one off n putting the new on that I should have done???
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Old 12-31-2012, 03:17 AM   #4 (permalink)
Kappa9012
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nope that should be it. If the heater on the filter head doesn't kick on when the truck is plugged in, i'm not sure why else the filter would be plugging.

Does your DIC show you fuel filter % life? if it does I'd bet it drops to zero % when the truck dies.
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Old 12-31-2012, 10:13 AM   #5 (permalink)
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My truck was doing that. Ended up ordering a O-ring kit and rebuilt the filter head.

My theory was that when it gets really cold outside, those O-rings shrink just enough to cause a problem.
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Old 12-31-2012, 10:49 AM   #6 (permalink)
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Sounds like you might have an air leak. Recheck the fuel filter and make sure the gaskets are good and everything is tight.
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Old 12-31-2012, 10:53 AM   #7 (permalink)
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If its cold, the o-rings in the filter head probably shrunk and have developed an air leak. Time for a filter head rebuild.
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Old 12-31-2012, 11:00 AM   #8 (permalink)
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If you are hitting the plunger after it stalls, and the plunger isn't very firm, there is an air leak somewhere.
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Old 12-31-2012, 11:01 AM   #9 (permalink)
SLT223
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Quote:
Originally Posted by skleppy View Post
If its cold, the o-rings in the filter head probably shrunk and have developed an air leak. Time for a filter head rebuild.
^^^^^^ This ^^^^^^^
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Old 12-31-2012, 11:19 AM   #10 (permalink)
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Reseal the fliter head. The seal kit is NOT available from GM, as they only service a new housing-$$$.

The Forum supporting vendors listed here can provide you a seal kit for less than $25, and only takes 15 minutes to install the parts.
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