Getting fuel to the Throttle body no fuel in the Throttle body

KSNYDER134

MEMBER
1985 CHEVROLET BLAZER
5.7L
V8
4WD
AUTOMATIC
120,000 MILES

I have an 1985 K5 Blazer with a 5.7 TBI motor from a 1990 Silverado. The fuel pump went out after sitting for 10 plus years. Replaced the fuel pump, fuel is making it all the way to the Throttle body, but not into it or through the injectors. If I pour gas into the Throttle body it will start and run long enough to burn the said gas. So I have spark, and I have fuel making it 90% of the way to the Throttle body. I am stumped.

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good evening,

Use a test light or voltmeter and check for voltage to the fuel injector connector. Each injector should have a 12 volt signal with the key on. The other wire goes to the ECM for grounding.

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

If you have power to the injector, you will need a noid light to verify the ECM is commanding the injector to fire.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Roy

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Tuesday, December 29th, 2020 AT 6:02 PM

KSNYDER134

MEMBER
3 POSTS

I didn’t have a meter the day we were trying to start it. Should I look at the fuel pressure regulator as well? I heard people talking about rebuilding the throttle body. I will check the injectors and get a noid light. Thanks for the reply.

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Wednesday, December 30th, 2020 AT 1:41 PM

ASEMASTER6371