Fuel system gremlins

[Esotericimage]

Ok, heres a fascinating problem that keep coming up every 3 weeks or so.

Ill be driving along and doesnt matter how much fuel i have in the tank, I lose fuel pressure. Let the car sit for 20-30 mins and it starts back up like nothing happened.

Now, I can hear the fuel pump prime when I turn on the ignition which rules out bad fuel pump,fuel pump relay.


Any Ideas guys? RonJ this should perplex you too!


edit: i probably should replace the fuel filter since i havent done so..

 

[Gonzo]

how do you know its fuel pressure?. FPR?

 

[Esotericimage]

I have a gauge on top of the fuel filter.

 

[RonJ]

What comes first, the engine stall or the loss in fuel pressure? Give us a better sense about the sequence of events.

 

[Esotericimage]

well im sure its the loss of pressure that causes the stall.. then Ill try and crank it , ill hear the FP prime but ill look under the hood and im showing 3Lbs of pressure..


Could it be the pressure relief valve on the side of the tank?

 

[RonJ]

Why don't you think the fuel pump is toast? Hearing the fuel pump run and it actually pressuring the gas line are not necessarily linked.

 

[Esotericimage]

its a new fuel pump.. installed in august

 

[RonJ]

Replace the fuel filter just to rule it out, though I don't think it's the problem. If the problem persists, I'd swap in a known good fuel pump as I think the new one is faulty.