Mechanics

FORD F-150 FUEL PRESSURE PROBLEM

1999 Ford F-150 • 130,000 miles

I have a 99 f150 5.4. It runs fine but I have to prime the fuel system before I can start it about 5 to 6 time. I have changed fuel pressure regulator, fuel pump, fuel filter. I have also removed the fuel rail and checked the injectors for leaks but none found. What else can I check? Fuel pressure drops to zero as soon as the key is turn off.
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November 9, 2012.



You either have a fuel leak or a ad check valve in the fuel pump.

Roy