Fuel pump will not shut off

Tiny
BRONCOLOST
  • MEMBER
  • 1990 FORD BRONCO
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
The fuel pump wont shut off until it drains the battery or the battery is disconnected. I can't figure out the Chilton book. Need to know where the fuses are and the power wires.
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Sunday, May 5th, 2019 AT 4:58 PM

6 Replies

Tiny
SCGRANTURISMO
  • EXPERT
Hello,

This sounds like you have a short to power somewhere in the wires going to the fuel pump which is located in your vehicle's fuel tank. Does your vehicle have 1 or 2 fuel tanks?

Thanks,
Alex
2CarPros
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Sunday, May 5th, 2019 AT 9:59 PM
Tiny
BRONCOLOST
  • MEMBER
It has one tank.
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Monday, May 6th, 2019 AT 1:49 PM
Tiny
SCGRANTURISMO
  • EXPERT
Hello again,

In the diagrams down below I have included a wiring diagram for your vehicle's fuel pump as well the exploded diagram of the pump and a description of the EFI system. With the ignition key off I want you to take a voltage reading pin #86 of the fuel pump relay. I have included a link below if you are unfamiliar with how to use a multimeter.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Please get back to us with what your voltage reading and we will go from there.

Thanks,
Alex
2CarPros
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Monday, May 6th, 2019 AT 3:09 PM
Tiny
BRONCOLOST
  • MEMBER
The battery is completely dead and will not hold a charge because I didnt charge it during our cold Alaska winter I have to buy a new one next payday. I will have to get some help. To do the reading dont have a meter. I will let u know when it's done. Michelle
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Tuesday, May 7th, 2019 AT 8:20 AM
Tiny
KEN
  • ADMIN
Please let us know what you find. We are interested to see what it is.
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Friday, May 10th, 2019 AT 10:43 AM
Tiny
BRONCOLOST
  • MEMBER
I will.
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Friday, May 10th, 2019 AT 10:12 PM

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