Not starting

1997 CHEVROLET SUBURBAN

180,000 MILES • 5.6L • V6 • 2WD • AUTOMATIC

PHXFRED

MEMBER
1 POST

Changed fuel pump it ran for 2 weeks then stopped. Apparently it was a bad fuel pump. got a new one replaced fuel filter and it ran for 2 days then again stopped. Replaced fuel pressure regulator and relay but still no start. Have good spark fuel pump turns on and relay works. It only starts if starter fluid is sprayed and then it runs for about 30 seconds or less then shuts off again any help??

May 3, 2021 at 7:12 PM

ASEMASTER6371

✓Experienced Mechanic
52,796 POSTS

Good morning,

I would start by checking the actual fuel pressure to confirm it is the pump again.

The spec is attached below. You can rent a tester at a parts store for this test.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If the pressure is low, you need to verify the proper voltage to the pump. Without the proper voltage, it will not function correctly. I attached wiring diagrams for you as well.

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

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

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

If that is correct, then it is the pump itself.

You may need to drop the tank and drain all the fuel and flush the tank. If you have dirt or debris in the tank, that alone will cause the constant failure of pumps as the dirt causes damage to the pump windings.

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

Roy

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May 3, 2021 at 9:42 PM