Fuel pump will not shut off

Tiny
RANGER812572
  • MEMBER
  • 1992 FORD F-150
  • 4.9L
  • 6 CYL
  • 2WD
  • MANUAL
  • 232,000 MILES
The fuel pump will not shut off when you turn the key to run. The relays click spastically and once in a while the pump will stop. When the pump does stop the truck will start and run for a moment. If it does not stop, the truck will not start. It cranks no problem. Battery charged, new fuel pump relay, same problem. This happens with both tanks. Please help!
Monday, August 25th, 2014 AT 8:50 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If the pump continues to run then this may be a pcm problem as it tells the relay when and when to not work. Since you have already replaced the relay and makes no difference the I would suspect the ecm more than anything. The only other thing I can think of is the fuelpump cutoff relay which I have included a pic.
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Friday, February 12th, 2021 AT 11:54 AM

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