air in diesel fuel filter in my 2005 lly - Chevy and GMC Duramax Diesel Forum
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post #1 of 5 (permalink) Old 01-18-2020, 12:24 PM Thread Starter
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air in diesel fuel filter in my 2005 lly

im having trouble with fuel filter not staying primed. there are no codes to share with you knowledgeable guys. i changed the filter,ac brand, primed it and the truck started right away. drove it last night ,no problem, got back in it this morning, drove a few miles and it quit. checked the hand pump on the filter and it was soft.pumped it up and the truck started and is running again.
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post #2 of 5 (permalink) Old 01-18-2020, 01:05 PM
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Could have been a bubble that didn't get primed out. If there were no problems before the filter change, could be a bad "O" ring seal or maybe the bleeder screw is not seating.

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post #3 of 5 (permalink) Old 01-18-2020, 01:09 PM
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Many times after a filter change, disturbing the marginal seals in the filter head (priming) reveals their condition of decay...and you lose prime.

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post #4 of 5 (permalink) Old 01-19-2020, 05:54 PM
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Filter head probably needs to be rebuilt or replaced.

With some stuff.
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post #5 of 5 (permalink) Old 01-20-2020, 07:07 AM
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Originally Posted by HWI View Post
Filter head probably needs to be rebuilt or replaced.
That is a good start...........Get a new filter head and filter at Rock for $100 or so. If it still happens it could be an air leak between the tank and filter head. Replace the 1/2" (supply) braided fuel lines below driver and on the left side of the engine.

If those fail it could also be the braided line on top of the fuel tank or a cracked intake/pickup insdie the tank. This would only manifest itself when the fuel level drops below that crack. It can be checked by filling the tank full and seeing if it still happens

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