No fuel pressure when testing with key on engine off
I keep getting DTC codes PO171 & PO174. I've done all the troubleshooting
as far as monitor the fuel trims, check for vacuum leaks, MAF sensor, O2
sensors. I believe the problem is fuel related. The vehicle starts fine and holds
between 32 and 36 lbs of pressure when running but the pressure drops to
zero when not running. With key on engine off I still have zero pressure.
Search Ford Expedition Questions
Ford Expedition Experts