Fuel pump testing

2004 GMC YUKON

237,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC

JONSOLOW13

MEMBER
133 POSTS

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

Feb 18, 2020 at 6:03 PM

JACOBANDNICKOLAS

✓ASE Certified Mechanic
110,194 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

Image (Click to enlarge)

Professional Diagram for 2CarPros Members
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Feb 18, 2020 at 6:30 PM

JONSOLOW13

MEMBER
133 POSTS

This sure does help. You guys are amazing. thanks very much!

Feb 18, 2020 at 6:35 PM

JACOBANDNICKOLAS

✓ASE Certified Mechanic
110,194 POSTS

You are very welcome. Let me know if you have other questions or need help.

Take care,
Joe

Feb 18, 2020 at 8:06 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.