First check the rubber fuel lines between the tank and the engine. GM published a bulletin that says that additives that many suppliers blend into modern diesel fuel softens the flex lines, especially on the frame near the transmission and at the fuel filter, and when the CP3 tries to pull fuel all the way from the tank the lines collapse, restricts fuel flow, and sets a low fuel rail pressure code. More common in hot weather but sometimes happens in cold weather as well. The two lines at the fuel filter are usually the first to give trouble and they're really easy to replace.
07 GMC Sierra Classic (LBZ) Duramax Dually Crewcab 4X4, S&B Intake, bypass engine oil filter, synthetic lubes; 84 Chevy 6.2L 1.25 Ton (Army CUCV) with Banks Sidewinder Turbo and Gear Vendor's Overdrive; 83 Chevy Suburban 6.2L 4X4; Retired Journeyman Heavy Duty Truck Mechanic
Last edited by campingguy; 12-20-2013 at 08:06 PM.