08 LMM 0%fuel filter life / Power derate - Page 2 - Diesel Bombers



Chevy/GMC Duramax 07.5 -10 LMM Discussion of Chevy and GMC Trucks with LMM Duramax Turbo Diesel Engines

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  #11  
Old 07-03-2015, 12:59 PM
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Location: Hico,Texas
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Yup I'm going now to get it hooked up to a scanner. It's got to be a sensor not working rite
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  #12  
Old 06-11-2016, 12:01 AM
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Originally Posted by gone ropin View Post
Yup I'm going now to get it hooked up to a scanner. It's got to be a sensor not working rite
I was wondering if you had any update on your issue. I also have the same problem when I hook up my LQ horse trailer. Having hell trying to figure it out.
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  #13  
Old 06-17-2016, 08:41 AM
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I had the same problem with my 2009. Pulled filter head apart and found it full of rubber fuel line. Removed fuel lines from steel line to engine and found it was coming apart.
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  #14  
Old 07-06-2017, 03:04 PM
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Default same fuel filter/derating issue 08 d-max

I've got this same issue driving me crazy on one of our fleet trucks- 08 2500HD with the duramax. 156K miles. We installed the airdog system and did a full dpf delete. Running an H&S Mini Maxx tow tune.

When the truck is pulling heavy (#10K+ trailers) and under hard load (like a climbing a grade), the fuel filter will go from 100% to 0% and if I don't back out of the throttle immediately, it will de-rate. When you clear the code 0087 (fuel rail pressure), filter goes back to 100% and full power stays. If you stay in the throttle when the filter message comes on, it de-rates. Coming back from a job in the mountains I just kept my scanner plugged in and reset it every time the filter would drop to 0%.

There doesn't seem to be any issue with driveability, the truck doesn't stumble, hesitate, misfire, nothing. It just de-rates with little warning. Fuel filter changes don't help- I cut open the engine mounted WIX filter and it was very clean. I've inspected all the fuel lines from the tank to the filter, all good.

I haven't checked fuel pressure at the air dog yet but its brand new so not a suspect. I have a feeling I'm dealing with the fuel pressure sensor acting up. Need to get a scanner on it but its hard to duplicate the condition on demand. Idle is good so I think the FPR is OK.

Ideas? I am tired of throwing money at this thing.
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