Fuel Pump?

[mystic184]

I have an 02 Explorer that has had intermittent starting problems. I have suspected a fuel pressure problem so I hooked up a gauge and tested it. When I turn the key on it jumps to 40-50psi then back to zero. When starting, it pressurizes again and once started it maintains 65-70psi. Am I correct in assuming that the fuel system should remain pressurized while the key is on before cranking? I have checked and there are no fuel leaks anywhere that I can tell. Is there a check valve in the fuel pump (or anywhere in the system) that could be bad? I'm just trying to narrow down potential problems.

Any help is appreciated.

 

[cross6]

Fuel pump and pressure sensor went out on my 04 mountaineer symptoms were random stalling while driving, stalling while idling, and a CEL and p0173 code. Never experienced hard starts.

 

[mystic184]

I'm not seeing any of those problems. Once started it runs fine.

Thanks for the reply.