So I having what I think is a fuel problem. Start up and will drive for a while then after a bit it will pretty much almost stall out. If you hit the gas nothing. Wait a few second and ease into the pedal if will have some power but not much. I checked fuel pressure at the rail. Have 30 psi and 40 when I disconnected the vacuum line. It seems a bit low to me.

oh yeah with truck off for 5 minutes it’s still holding 30psi

Do you think the pump and regulator are ok? Or anything else I check. I’m stumped!!

2001 F150 5.4 Supercew 4x4.

As always. Thanks Marty

 

Oh yeah with tray just shut off after running for 5 minutes with pressure gauge attached. Still holding 30 pounds

 

I'd replace the fuel filter.

 

Crap…so sorry I forgot the mention I did that before the test. I should have before and after

 

That pressure coincides with what mine has read every time I've checked it on my 2002 5.4. Put a couple of bottles of Chevron Techron in the gas.

 

If it stalls out while the pressure stays at 30+ psi, fuel delivery isn't the problem.

 

Do you have any codes ?

 

No I do not.

 

All of your fuel pressure readings look normal.

It might be an air problem. Check the idle air control valve. Or it could be a sensor problem but those normally throw a code.

Otherwise, you may need to get some better diagnostics. If you don't have the equipment then it may be necessary to pay someone run a diagnostic.