Fuel pumps do not shut off when key is on

Tiny
BOYDREED
  • MEMBER
  • 1988 FORD BRONCO
  • 2.9L
  • V6
  • 4WD
  • MANUAL
  • 186,000 MILES
The fuel pumps will not shut off anytime the key is on. They run I replaced the pressure control valve and the relay. Nothing has helped yet. Need help please.
Thursday, October 11th, 2018 AT 8:47 PM

1 Reply

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

The ECM is what controls the fuel pump. They should come on for two seconds with the key on. Then they will come on all the time with the key cranking and the engine running.

If you replace the relay, then most likely it is the ECM that has failed.

Roy

It is inside the right under the right side of the dash by the cowl.
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Friday, October 12th, 2018 AT 5:52 AM

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