I work at a shop and we have had this poor ladies truck for over 2 weeks. She came in complaining that the truck would run normally but would not restart when hot. The dealer recommended all new injectors, we suspected injectors had excessive leak back, so we replaced all six. After replacing injectors (without any special tools) the truck now shuts off by itself after a few minutes. It will always restart no problem. The high pressure fuel reading starts at about 4800, and then slowly drops over a few minutes until about 2700 psi and then the engine dies. Unplugging the FCA makes doesn't seem to make a difference. The flow test from the low pressure pump seems shows low fuel flow, but the pressure from the low side is about 15 psi. Any thoughts? New filter in the separator bowl, but not sure if there's a frame filter or not.
Thanks in advance.
Joe

 

Solved the issue, the high pressure lines from the rail to the head were not tight enough at the head. Torque spec is 44 FOOT POUNDS on those fittings. They were snug but not torqued down. After using a crows foot and a torque wrench, the truck is holding fuel pressure at idle of 5300 psi!!!