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Fuel pump testing

Tiny
JONSOLOW13
  • MEMBER
  • 2004 GMC YUKON
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 237,000 MILES
Just installed a new fuel pump on my SUV listed above. It's not getting current. We checked the relay and fuses and they're okay. Before removing the gas tank and checking to see if it's plugged in, we want to hot wire it and see if it's getting current. Could you supply me a wiring diagram to allow us to access the correct wires?

Thanks,

Jon
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Tuesday, February 18th, 2020 AT 6:03 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
Hi,

I attached a pic from the schematic. The purple wire that ends is for the fuel level and runs to the PCM.

Here are a few links you may find helpful when testing for power, the relay and so on:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

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

https://www.2carpros.com/articles/how-to-check-wiring

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

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

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

Let me know if this helps or if you have other questions.

Take care,
Joe
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Tuesday, February 18th, 2020 AT 6:30 PM
Tiny
JONSOLOW13
  • MEMBER
  • 126 POSTS
This sure does help. You guys are amazing. Thanks very much!
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Tuesday, February 18th, 2020 AT 6:35 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
You are very welcome. Let me know if you have other questions or need help.

Take care,
Joe
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Tuesday, February 18th, 2020 AT 8:06 PM

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