Fuel pump

Tiny
KINGRI
  • MEMBER
  • 1998 FORD F-150
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
Truck quit while I was driving down the road.
I turn the ignition key on the fuel pump has 12 volts and runs for one or two seconds, then quits running. At this point there is 6.32 volts at pump. I assumed fuel pump since there was no pressure at port on fuel rail. I have bed off so pump is accessible. I pulled pump off to go get another and decided to test straight of battery and it ran in my hand. Then started checking voltages. I plugged pump back up and left sitting on frame. Pulled relay and inserted a jumper and pump runs continuously. Is there a fuel pressure sensor that would tell PCM to shut down the pump after a couple of seconds?
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Tuesday, July 12th, 2016 AT 10:44 AM

1 Reply

Tiny
WRENCHTECH
  • MEMBER
That is exactly how it is supposed to work. You get a two second prime and then it shuts off until the computer sees a crank RPM signal.
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Tuesday, July 12th, 2016 AT 10:56 AM

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