Question: 2008 LMM P0088 High Fuel rail pressure headache - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Duramax Fourth Generation: 2007.5-2010 (LMM) Discuss the fourth generation (2007.5-2010) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 03-05-2020, 01:08 PM   #1 (permalink)
Derby45
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2008 LMM P0088 High Fuel rail pressure headache

I keep getting a P0088 code every time I drive this thing, pickup never goes into limp mode but will ding to let me know its throwing the code. pickup seems to run fine but I do notice it seems to surge at times. I want to guess that somethings wrong with the fass system but not real sure where to start with this thing. Anyone ever had this problem before. All the info on deletes and mods is in my bio.

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Last edited by OkDually; 03-05-2020 at 01:35 PM. Reason: prefix/sig
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Old 03-05-2020, 01:38 PM   #2 (permalink)
OkDually
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Welcome to DieselPlace
Here is a diagnostic thread on the P0088 code:
https://www.dieselplace.com/forum/63...ighlight=P0088

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Old 03-05-2020, 06:59 PM   #3 (permalink)
oldschoolbowtie
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Quote:
Originally Posted by OkDually View Post
Welcome to DieselPlace
Here is a diagnostic thread on the P0088 code:
https://www.dieselplace.com/forum/63...ighlight=P0088


welcome and good luck
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Old 03-06-2020, 12:55 PM   #4 (permalink)
Ron Nielson
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You need to know how much fuel pressure is being provided by FASS, at idle and while running, particularly in the conditions that cause problems. If you're not in the 5-7 lbs figure, getting it there very well may be the easiest and cheapest solution to the problem.
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Old 03-07-2020, 02:03 PM   #5 (permalink)
D_R_C
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Along with Ron’s suggestion above ^^^, you need to know the fuel rail pressures, something like the Edge Insight will provide this along with a bunch of other gauges.
The fuel psi out of a FASS 95 should be in the 8-10 range a little lower will be ok and be safe.
This you’ll need a separate fuel psi gauge either connected off the fuel pump or tested off the fuel test port near the alternator, these 2 are the easier ways.

You could also get under your truck and follow the fuel line from the liftpump to the engine.
There will be a couple of short sections of rubber fuel line, check those hoses they also could be a problem if there’re soft, maybe collapsing under load.
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Last edited by D_R_C; 03-07-2020 at 02:04 PM.
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