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Where is the fuel pump relay located?

Tiny
L2WO4OUR
  • MEMBER
  • 1991 CADILLAC BROUGHAM
  • 159,000 MILES
So every time I pass the key to turn on the car I hear the fuel pump turn on but never turn off. Sounds like gas splashing inside the tank along with loud noise. From what I been told if the fuel pump relay is not working right either the fuel pump wont turn on or it will stay on and not turn off. Can this be true?
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Friday, July 27th, 2012 AT 4:29 PM

12 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Hello,

The fuel pump relay is under the hood int he PDC. Here is a guide to help you test it and the location in the diagrams below.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Friday, July 27th, 2012 AT 4:31 PM
Tiny
L2WO4OUR
  • MEMBER
  • 20 POSTS
No it stops once its off. But if I pass the key with the engine off the pump turns on makes loud noise and you can hear gas splashing.
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Friday, July 27th, 2012 AT 5:13 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You most likely need a fuel pump.

Roy
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Friday, July 27th, 2012 AT 5:20 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
If the fuel pump is turning on the relay is doing its job. Sounds like u will need to drop the tank. Remove the sending unit and replace the pump. Install a new one using all the hoses that come with the part. Ty for using 2carpros and pl try to donate.
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Saturday, July 28th, 2012 AT 3:58 PM
Tiny
JGROFF05
  • MEMBER
  • 14 POSTS
  • 1991 CADILLAC BROUGHAM
  • V8
  • 2WD
  • AUTOMATIC
  • 185,000 MILES
I am wondering if the 1991 cadillac brougham d elegance has an inertia swith or a fuel pump cutoff switch. If so could you please tell me where it is located. I believe it would be located near the trunk area. Thanks for your help.
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Wednesday, December 9th, 2020 AT 2:03 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
There is no inertia (fuel shut-off) switch on your vehicle. Have you inspected your fuel pump fuse and fuel pump relay?
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Wednesday, December 9th, 2020 AT 2:03 PM (Merged)
Tiny
JGROFF05
  • MEMBER
  • 14 POSTS
Yes I have I just replaced the pump and fixed itbut now my gas gauge does not work. I was just wonderign if there is a way to reset the fuel gauge or maybe the floater might be stuck. I will try unplugging the terminals in the battery if this will do it. If you have any other suggestiongs please help.
Thanks
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Wednesday, December 9th, 2020 AT 2:03 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Was the guage working prior to the pump replacement? Perhaps you knocked or left something loose by accident at or around the fuel tank?
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Wednesday, December 9th, 2020 AT 2:03 PM (Merged)
Tiny
JGROFF05
  • MEMBER
  • 14 POSTS
Yes it was working prior to replacement. What could I have knocked loose. All the wires were working correctly
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Wednesday, December 9th, 2020 AT 2:03 PM (Merged)
Tiny
EMANUEL SMITH
  • MEMBER
  • 1 POST
  • 1990 CADILLAC BROUGHAM
  • 5.7L
  • 1,285 MILES
I don't know where the fuel pump is located. I don't know where the relay switch is located. I need to know where all three fuse boxes are located.
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Wednesday, December 9th, 2020 AT 2:03 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
So when you say the gauge isn't working, you do mean that the gauge is indicating Empty at all times, correct? Or is it just inaccurate? Have you inspected the gauges fuse? The only thing controlling the gauge is the wiring, the fuse for the gauges and then the fuel sending unit. So I'm thinking it has something to do with the sending unit since you did some repairs in that area.
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Wednesday, December 9th, 2020 AT 2:03 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

The fuel pump is in the fuel tank. I attached a picture of the fuel pump location and the relay location. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed
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Wednesday, December 9th, 2020 AT 2:03 PM (Merged)

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