relay and fuse box location

1987 CADILLAC DEVILLE
201,569 MILES • V8 • FWD • AUTOMATIC
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KLMYRIC
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  • 1 POST
how can i tell if my fuel pump is gone bad or if i have a relay problem, where is the relay box located?
Jan 25, 2010 at 10:55 AM
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KASEKENNY
  • CERTIFIED EXPERT
  • 18,907 POSTS
This could be a relay issue but the best way to check is find out if the fuel pump has power or just remove the relay and jump it to see if the pump comes on.

Here are a couple guides that will show more info on how to do this:

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

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Below is the info from the manual on the location of the relay and fuses. Plus the wiring diagrams that will give more detail on this.

Please let us know if you have other questions. Thanks
Jul 21, 2021 at 5:11 PM
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DANNY L
  • CERTIFIED EXPERT
  • 5,648 POSTS
Hello, I'm Danny.

If The relay turns out to not be the problem here are instructions on how to replace the in-tank electric fuel pump which is mounted inside the fuel tank. Here is a tutorial showing how to replace an in-tank electric fuel pump:

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

I've attached picture steps below on how to remove and replace both the fuel tank and fuel pump on your car. Hope this helps and thanks for using 2CarPros.
Jul 22, 2021 at 6:56 PM
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