Fuel pump replacement issue

2004 GMC YUKON
237,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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JONSOLOW13
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  • 133 POSTS
Per your previous instructions we replaced a bad fuel pump but there seems to be no current getting to the pump. engine turns but doesn't start.

Engine starts with starter fluid.

Could you give us instructions on how to diagnose and hopefully fix the issue (bad fuse or relay, etc.)?

Thanks.

Jon
Jan 16, 2020 at 9:02 AM
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ASEMASTER6371
  • CERTIFIED EXPERT
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Good morning,

I attached a diagram for you to view. Verify power to the fuel pump relay with the key on.

Jump pins 30 and 87 and see if the pump runs. That will check the wiring. You will be applying a voltage directly to the fuel pump. It will confirm the wiring is good to the pump.

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

Let us start there.

Roy
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Jan 16, 2020 at 9:24 AM