1999 Ford F 150 99 F150 5 4 Runs Fine Prime Fuel System Before Start About 5 6

1999 FORD F-150
130,000 MILES
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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.
Nov 9, 2012 at 12:26 AM
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ASEMASTER6371
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you either have a fuel leak or a ad check valve in the fuel pump.

Roy
Nov 9, 2012 at 4:24 AM
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