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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!
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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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