Bad fuel filter? - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 40 (permalink) Old 01-04-2020, 03:36 PM Thread Starter
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Bad fuel filter?

I've been trying to chase down a problem for a month and a half that has gotten worse since deleting it a month and a half ago.
I bought a used 2016 Denali with 70k on it about 2 months ago that is intermittently loosing power and blowing white smoke. I can get it to blow white smoke and also stutter a bit on que when I'm in park and rev it up to about 2200 RPM's or so.

The loss of power and tons of white smoke is new though and doesn't happen all the time. It clears up eventually and life goes on for a few days. My fuel filter life reads 92% as of today, which tells me it was replaced when it got traded in, but maybe they just reset it. It first started when I went to pass a semi while on my race tune (no lift pump) and I was WOT getting around the truck.
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post #2 of 40 (permalink) Old 01-04-2020, 05:30 PM
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Just change out the fuel filter and see if it helps.

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post #3 of 40 (permalink) Old 01-04-2020, 06:27 PM
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Mentioned many times before, but for 'bout $25 you can have a small compound gauge and bleed port adapter to measure psi @ idle, determines any filter restrictions without guessing on a $35-$40 filter.

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post #4 of 40 (permalink) Old 01-04-2020, 06:39 PM Thread Starter
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Well that would be nice to throw on and see, but now the truck wont even start. I can get it to kick over for about 1 second and then it falls flat on its face and dies.

I'll start with a new filter. Really hope its not the cp4
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post #5 of 40 (permalink) Old 01-04-2020, 06:43 PM Thread Starter
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Only filter I can get right now is a Micro Guard from O'Reilly's. My ACDelco filter is on its way from amazon and will be a few days. Any reason I should stay away from the Micro guard even if it is for a few days?
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post #6 of 40 (permalink) Old 01-04-2020, 06:43 PM
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Have you lost prime?
Is the primer button firm?

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post #7 of 40 (permalink) Old 01-04-2020, 07:07 PM Thread Starter
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Primer button is not firm. I just checked that. What would cause it to loose prime? And do i just open the bleeder valve and prime it till all air is out?
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post #8 of 40 (permalink) Old 01-04-2020, 07:10 PM
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You’ve got an air leak somewhere, o-rings in the filter head or a crack in the fuel line from tank to filter head.

To prime you pump the button until it gets hard, then back the screw off and let the air out until you get straight fuel.

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post #9 of 40 (permalink) Old 01-04-2020, 07:29 PM
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Quote:
Originally Posted by Ineedabiggertrailer16 View Post
Youve got an air leak somewhere, o-rings in the filter head or a crack in the fuel line from tank to filter head.

To prime you pump the button until it gets hard, then back the screw off and let the air out until you get straight fuel.
really,,I just changed my filter yesterday.I opened the bleeder,pumped till only fuel came out,closed bleeder,pumped till rock hard,started truck.didn't even stumble at all.

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post #10 of 40 (permalink) Old 01-04-2020, 07:30 PM
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I would just pump the primer button until firm, then try to start.
Opening the bleed screw lets the displaced air out from an empty filter after a change.
Your filter is already full of fuel, just pump until firm and start.

In extreme leak scenarios, you may also use an extra hand, continually pumping the primer while cranking.

Edit;
It's not uncommon for a failing seal to rear it's ugly head after a filter swap and prime....disturbing the seals in the primer button.

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