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bhedden 03-19-2009, 03:05 PM My 05 has only ever did the fuel limp mode when it was "chipped", the mode only allows you to turn 2,000 rpms but will go thru all 5 gears? any suggestions on how to fix it? I would also like to know what causes it, torque, cluches etc.?? Thanks 2005 Duramax, lly 6.6, Juice Sneeze480 03-19-2009, 04:39 PM Lots of problems cause the Low fuel rail pressure. (If thats what you are talking about) Common Culprits: Fuel Filter FPRV Fuel Leak Not so common: (doubt an edge chip could call for this much fuel) Lack of Lift pumps Lack of twin CP3's duramaxkid05 03-19-2009, 06:50 PM I shimed the fuel rail and it hasent done it since its like a o-ring it goes in the fuel rail. But if u shut ur truck off it resets itself correct???? bhedden 03-19-2009, 07:55 PM yes when you shut the pick up off it resets and then is fine. cant get it to do it in tow haul though. and i dont know if the edge is calling for that much fuel or not but it only did it once in the last two years with a quadzilla stealth. and has done it multiple times with the edge azduramax04 03-19-2009, 11:27 PM Mine has done it 6 times with the edge and a boost stick. Jettix2 03-20-2009, 07:49 AM How many miles? My truck has 98k on it, started doing this to me shortly after I bought it around 95k. Only did it with the boost turned up (ie, more demand on the fuel system).......Replaced the FPRV underneath the glow plug assy with a new FPRV (some people choose to use a race valve) and I haven't gotten it since. Ben Jettix2 03-20-2009, 10:03 AM Why? Huckstorf diesel sells both parts, and they recommended the LBZ valve for mine (slightly stronger than an LLY valve, I guess). The race valve doesn't have the capability to bleed off pressure in case of a sudden spike in rail pressure, and there is a chance of cracking the fuel rail = no thanks;) If I got 95k out of the OEM valve, it'll take me 10 more years to go that far again;) Ben JRENIGAR 03-20-2009, 11:07 AM ^^^ With last years diesel prices it would take me 10 years to afford it!!! Good luck!!! Kennedy 03-20-2009, 01:56 PM The key is to prevent this from happening by removing the restriction in the fuel system. This is handled by adding a lift pump. Do this first, keep your tuning sensible, and you should not have any problems. | ||