Low Fuel Rail Pressure Code - Chevy and GMC Duramax Diesel Forum

07.5-2010 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 08-18-2012, 05:54 PM Thread Starter
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Low Fuel Rail Pressure Code

Ok guys, I have an 08 duramax. When I'm pulling a load, which is most of my driving, it throws the low fuel rail pressure code. I took it to the Chevy house, and they said it was due to a leaking fuel filter housing. That did not fix the problem, so they ran tests and sent the results to a gm specialist somewhere. After a week, they don't know what the problem is. They suggest changing the injector pump and all 8 injectors, but don't know if that will fix it. I am in need of a lot of help here, and any help would be appreciated!!
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post #2 of 13 (permalink) Old 08-18-2012, 06:04 PM
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Is it under warranty? There are guys on here that are a lot more knowledgeable than me if they want to chime in but I would see if it is your fuel rail pressure relief valve before replacing pump and all injectors. If they did an injector balance and all checked out good I see no point at all. That is kind of ridiculous really. Anyway, shim kits for the fprv are like 15 bucks or you can plug it with a race plug for not much more. The shims did not work for me so I went with race plug and is much better. Also a lift pump like an airdogII that filters your fuel would also help save your injectors and feed the cp3 with positive fuel pressure.

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Last edited by Dman777; 08-19-2012 at 04:45 PM.
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post #3 of 13 (permalink) Old 08-18-2012, 06:32 PM
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Also, if you have a tune or programmer will make a difference. If you have a tune or programmer, will cause increased fuel demands and stock fuel rail fitting may not be allowing enough fuel into the rails when towing or with wide open throttle demands. If stock, probably something else. If you have a tune or programmer, maybe ported fuel rail fitting needed.

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post #4 of 13 (permalink) Old 08-18-2012, 10:52 PM Thread Starter
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Yeah, I have the Edge Evolution on my truck, but it's been there since day one. So are you suggesting getting a bigger fuel rail?
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post #5 of 13 (permalink) Old 08-18-2012, 11:07 PM
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Quote:
Originally Posted by 08dirtymaxx View Post
Yeah, I have the Edge Evolution on my truck, but it's been there since day one. So are you suggesting getting a bigger fuel rail?
Get rid of edge. Problem solved

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post #6 of 13 (permalink) Old 08-19-2012, 04:25 AM
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Your FPRV " fuel pressure relief valve" might be leaking, it bleeds off excess rail pressure. The spring gets weak and starts to bleed off rail pressure below the pop off pressure and throws this code. It is an easy fix but first make sure it is your problem by doing a simple bottle test, google " bottle test FPRV Duramax" perform this test and post the results back up...
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post #7 of 13 (permalink) Old 08-19-2012, 04:42 AM
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try shimming or put a plug in the fprv. also ditch the edge and get efi live

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post #8 of 13 (permalink) Old 08-19-2012, 11:05 AM
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Quote:
Originally Posted by 08dirtymaxx View Post
Yeah, I have the Edge Evolution on my truck, but it's been there since day one. So are you suggesting getting a bigger fuel rail?
No, not replacing the entire fuel rail. Only replacing the stock fuel rail fitting with a ported fuel rail fitting. My truck did not throw the code all the time. Seemed to be only when going up "Ranger Hill" on Interstate 20. Threw code 3 times, 2 of the times where going "Ranger Hill." Replaced the fuel rail fitting with ported fuel rail fitting, DTC no more.

2015 LML - Stock Turbo and Injectors, Built Tranny, Sportsman CP3
Dyno'd 2/6/16: 569 RWHP/1149 RWTQ

07.5 LMM (Sold to Willie Loewen on 8/30/14)
Dyno'd 4/13/13: 643 RWHP/1086 RWTQ

Thanks to A-Star Diesel Performance and Redline Mobile Dyno (George and Willie Loewen)
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post #9 of 13 (permalink) Old 08-20-2012, 05:24 PM
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one of my buddies hauls cars with his truck constantly. it's an lbz but it was stock and would throw those codes. the fuel lines on some trucks will collapse along the frame causing a low fuel rail pressure code. he had steel braded lines made for his so this wouldn't happen but if you are running a tune you should have a lift pump and this would almost certainly fix the issue.
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post #10 of 13 (permalink) Old 08-20-2012, 06:06 PM
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i had this exact problem. First i changed my lift pump (air dog 165 II) that didn't fix it so i got stronger fuel lines, that didn't fix it. 3rd i ported my rail like duramax381 said and i put in a FPRV (PPE race plug) that didn't do it either..

Last off i replaced my stock cp3 with the industrial injection CP3 43% over stock and that did the trick... all in all it costed me aprx $3300

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