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Discussion Starter · #1 ·
My 1990 Chevy 3500 flatbed with a 454 EFI and four speed trans is not getting any fuel. I have replaced the fuel filter, and though it had some crap in it it was not clogged. I have pressure up to the TB, but no fuel in the TB when I crank the engine. My initial thought was that the TB was clogged, but want to know what electronics need to be checked?

Thanks,
Ron
 

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Its the computer that energizes the fuel pump relay and also drives the ground circuit for the injectors-recommend you check the wiring and also for shorted injector that's taking out the other.

Do you have spark? The ignition control module inside the distributor is also prone to failure.

http://www.chevythunder.com/gm_throttle_body_injection_pg_1.htm

Also, do you have a Sierra C3? Post pics! :welcome: :)
 

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Discussion Starter · #3 ·
Its the computer that energizes the fuel pump relay and also drives the ground circuit for the injectors-recommend you check the wiring and also for shorted injector that's taking out the other.

Do you have spark? The ignition control module inside the distributor is also prone to failure.

http://www.chevythunder.com/gm_throttle_body_injection_pg_1.htm

Also, do you have a Sierra C3? Post pics! :welcome: :)
There is no fuel going into the TB, but there is spark. How can I check if an injector is shorted?

here is a pic of my C3
 

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