I HAVE A 99 F150 5

  • Tiny
  • Anonymous
  • 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.

Friday, November 9th, 2012 AT 12:26 AM

1 Reply

  • Tiny
  • ASEMaster6371
  • EXPERT
  • 25,554 POSTS

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

Roy

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Friday, November 9th, 2012 AT 4:24 AM

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