Fuel pump will not shut off

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.

Sunday, May 5th, 2019 AT 4:58 PM

6 Replies

SCGRANTURISMO

MECHANIC
4,897 POSTS

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

BRONCOLOST

MEMBER
4 POSTS

It has one tank.

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Monday, May 6th, 2019 AT 1:49 PM

SCGRANTURISMO

MECHANIC
4,897 POSTS

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

BRONCOLOST

MEMBER
4 POSTS

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