No start after fuel system work
Have an '08 f550 with a 6.4l in our shop right now. The truck was running down the highway fine and just quit. Upon inspection we found the fuel tank had been crushed. We replaced fuel tank, in-tank fuel pump, fuel filters, and bled the system. Before the work was done we had about 7000 psi fuel rail pressure, now its anywhere between 90-2400 psi. Sitting for a while seems to help increase the pressure but it drops off. We also changed the CMP sensor (under direction of Ford). I also tested the CKP sensor and it tests out fine. The truck wont fire and barely fires with a sniff of ether. Is it possible there could still be air in the system? We have been bleeding from the filter housing, cooler lines, and a high pressure line that goes from HPFP to the left side valve bank. Had inactive codes p2291 (low injector control pressure) and p0231 (low voltage to fuel pump) but both codes have cleared themselves. Tested all applicable fuses, relays, diodes, and reset the fuel shut off switch. Need some suggestions, this truck has been here way too long. Truck is factory stock, no programmer or egr delete.