Fuel pumps will not stop running

1988 FORD BRONCO
187,000 MILES • 2.9L • 6 CYL • 4WD
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BOYDREED
  • MEMBER
  • 2 POSTS
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.
Nov 1, 2018 at 9:22 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
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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Nov 2, 2018 at 2:17 AM
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