What should the fuel pressure be for a 2006 6.0? If I can believe my Chinese pressure gage I have 50psi when the pump is running and 40psi once the pump is off. It holds at 40psi. The engine is hard starting and will run for a second or 2 and as long as 20 seconds and then stops. I have no idea how old the fuel pump is. 255k miles on this one.

