08 LMM change fuel filter warning - Chevy and GMC Duramax Diesel Forum
07.5-10 LMM 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 13 (permalink) Old 04-02-2019, 01:47 PM Thread Starter
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08 LMM change fuel filter warning

I recently purchased an 08 LMM with 140k ( my first diesel). Drives great. Took my toy hauler out and got the change fuel filter warning and instantly went into limp mode. After changing the filter and the sensor I rebuilt the fuel filter housing. It doesn't go into limp mode but once I get on the gas it says change fuel filter still. Goes from 100 to 0. The fuel lines to the filter look crack. Replacing those next. Could the fuel lines really be causing that warning?

Also are lift pumps worth the investment?
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post #2 of 13 (permalink) Old 04-02-2019, 02:09 PM
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Yes and yes.
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post #3 of 13 (permalink) Old 04-02-2019, 02:11 PM
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If you are referencing to the rubber ones underneath the truck going up then, Yes. They will cave in on them selves and collapse with high draw of fuel.


https://www.duramaxforum.com/forum/0...ollapsing.html

2008 Silverado LTZ
Tuned with EFI Live
6 inch lift by Fabtech
35 inch BFG K02 All terrain Tires

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post #4 of 13 (permalink) Old 04-02-2019, 02:43 PM Thread Starter
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Originally Posted by mkayler View Post
If you are referencing to the rubber ones underneath the truck going up then, Yes. They will cave in on them selves and collapse with high draw of fuel.


https://www.duramaxforum.com/forum/0...ollapsing.html
I can see cracking on the hoses to the fuel filter. I am hoping that's my issue. Driving to and from work there's no problem only when I get the rpms up around 2500 it says change fuel filter.

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post #5 of 13 (permalink) Old 04-02-2019, 03:01 PM Thread Starter
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Originally Posted by MIkey52 View Post
Yes and yes.
If I add a Lift pump can I leave the OEM filter? ( I dont want to delete it ) Also will the lift pump filters, How often do you change those?
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post #6 of 13 (permalink) Old 04-08-2019, 06:05 PM Thread Starter
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After replacing the hoses at the fuel filter I'm still getting the change fuel filter warning (going up hill with 2k rpm). I had a mechanic do the swap and a full service to the truck. No codes. Besides adding a lift pump any more suggestions

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post #7 of 13 (permalink) Old 04-09-2019, 10:54 AM
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One possible solution is to replace your fuel filter head with a new OEM filter head. I know you rebuilt yours, but that sometimes doesn't work well enough. New filter head with new filter is in the range of $135 (or less). Not a difficult job. Of course there could be other causes, other leaks (suction, not pressure) anywhere in the fuel line from inside the tank to the fuel filter head. Does your problem seem to be more prevalent with a low fuel level in your tank, or high fuel level, or doesn't make a difference?

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post #8 of 13 (permalink) Old 04-09-2019, 11:07 AM Thread Starter
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Quote:
Originally Posted by Ron Nielson View Post
One possible solution is to replace your fuel filter head with a new OEM filter head. I know you rebuilt yours, but that sometimes doesn't work well enough. New filter head with new filter is in the range of $135 (or less). Not a difficult job. Of course there could be other causes, other leaks (suction, not pressure) anywhere in the fuel line from inside the tank to the fuel filter head. Does your problem seem to be more prevalent with a low fuel level in your tank, or high fuel level, or doesn't make a difference?
I have not noticed the level in tank being constant with the issue. Just when I need more fuel it says change fuel filter? I will def look into replacing that.

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post #9 of 13 (permalink) Old 04-09-2019, 01:42 PM Thread Starter
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Quote:
Originally Posted by Ron Nielson View Post
One possible solution is to replace your fuel filter head with a new OEM filter head. I know you rebuilt yours, but that sometimes doesn't work well enough. New filter head with new filter is in the range of $135 (or less). Not a difficult job. Of course there could be other causes, other leaks (suction, not pressure) anywhere in the fuel line from inside the tank to the fuel filter head. Does your problem seem to be more prevalent with a low fuel level in your tank, or high fuel level, or doesn't make a difference?
Just found this. The hose is kinked and a little soft. Added a hose clamp to straighten it out. Could this be the issue?
Attached Images
File Type: jpg Fuel line ( Kink).jpg (66.8 KB, 31 views)

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post #10 of 13 (permalink) Old 04-09-2019, 07:19 PM
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Originally Posted by BrandonB View Post
Just when I need more fuel it says change fuel filter?
Do you mean that after your fill up, or add fuel, then the problem occurs? Please explain.

Ron Nielson
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