low fuel rail pressure - Chevy and GMC Duramax Diesel Forum
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Old 09-12-2008, 05:53 PM   eBay Motors  #1 (permalink)
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low fuel rail pressure

We own a 2006 chevy silverado extended cab dually diesel and my husband tows campers with it. It has been an excellent truck until recently. When he hauls the campers the engine light comes on and he cannot go the speed limit at all. The truck will max out at about 50 mph. When we run the codes it says low fuel rail pressure. We took it to the dealer put 3000 dollars into it and it is still the same. Any ideas would be helpful. Thanks
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Old 09-12-2008, 06:09 PM   eBay Motors  #2 (permalink)
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do you have any kind of tuning on it, when was the filter last changed. you may have a weak cp3(injection pump) that is what comes to mind right off the bat. if all of the above is good you may want to look into a lift pump like the fass, tts, etc that should help keep your rail pressure up.. also if you could get the codes and post them it would also help diagnose your problem a bit more
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Old 09-12-2008, 06:15 PM   eBay Motors  #3 (permalink)
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We change the filter often due to the high miles he puts on it. It is all stock no extras and the code that comes up is P0087. I appreciate your help.
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Old 09-12-2008, 06:30 PM   eBay Motors  #4 (permalink)
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you may also want to get ppe's release valve shim that may help. what repairs did the dealer perform
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Old 09-12-2008, 06:36 PM   eBay Motors  #5 (permalink)
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The dealer replaced something in the fuel tank and reset the computer. A new egr valve was put on and new filters. What is this ppe release valve shim and where do i get it?
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Old 09-12-2008, 07:00 PM   eBay Motors  #6 (permalink)
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I had the same code pop up on my truck. I changed the fuel filter and put in the ppe shime kit. I cost about 9 dollars. I havn't seen that code since then. I think I am going to put a air dog lift pump on mine. You can get the shime kit from Pacific Performance Engineering - Diesel Specialists
That stands for Pacific Performance Engineeing.
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Old 09-12-2008, 07:12 PM   eBay Motors  #7 (permalink)
Yep!
 
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It could also be that the fuel pressure regulator valve is going bad.
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Old 09-12-2008, 08:41 PM   eBay Motors  #8 (permalink)
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Take back to the dealer and have them fix it right!!! It ,as explained above could be numerous things.......I don't see the p/u tube in the take being one of them. Possibly could be a crack inthe fuel filter housing, etc..... TAKE BACK TO DEALER!!!!! YOU alreday paid to have this concern fixed. And it wasn't. (Just a GM Med Duty tech $0.02)
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Old 09-13-2008, 08:37 AM   eBay Motors  #9 (permalink)
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it is not a weak CP3 pump,i have had this happen to my LBZ sevaral times and heres the most notorious ones..
weak FRV(Fuel Rail Valve),how to fix is either replacing with stock,putting a shim kit in or a race valve in.
Injector Control Mobule Harness,if it is bad it will cause stuff like that also.
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Old 09-13-2008, 02:41 PM   eBay Motors  #10 (permalink)
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I agree with jaydawg. $3000 is a lot to spend and not have the problem fixed. P0087 code has nothing to do with the EGR valve. Also since the truck is all stock I would not recommend blocking off the fuel pressure relief valve or installing an aftermarket lift pump.

P0087 sets when the computer can not raise the fuel pressure up to the desired pressure. This can be caused by several problems. The most likely is the fuel filter, which you have eliminated. Any thing more then this and it is harder to diagnosis and takes some special tools.

It could be a restriction or a leak on the supply line between the fuel tank and the injection pump.
It could be a weak injection pump not able to increase fuel pressure up to the maximum under load.
It also could be one or more injectors have high return rate. Which means one or more injectors are returning so much fuel back the return line the the injection pump can not keep up with the fuel demand.
So as you can see this issue can be hard to figure out with out the correct tools. (Just another opinion of another GM Diesel tech)
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