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Fuel pumps will not stop running

Tiny
BOYDREED
  • MEMBER
  • 1988 FORD BRONCO
  • 2.9L
  • 6 CYL
  • 4WD
  • 187,000 MILES
I had to replace the fuel pumps and the fuel pump relay, but anytime that the switch is on the fuel pumps are running. I need help really bad. I also replaced the fuel pressure valve.
Thursday, November 1st, 2018 AT 9:22 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

The fuel pump relay is what passes current to the fuel pump. It is controlled by the ECM. It is supposed to run for two seconds, key on and then full time when cranking and running.

The only two controls are the relay and the ECM.

Did you try a new relay?

If you did and it is still happening, then the ECM could be the issue.

Roy
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Friday, November 2nd, 2018 AT 2:17 AM

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