Question about 1995 GMC Jimmy

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Fuel is not getting to the TBI unit. What's wrong

Fuel is not getting to the TBI unit. What's wrong

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Check your fuel pressure. or check for clogged filter

Posted on Sep 30, 2009

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GMC Yukon cranks over but will not start. It did act up for awhile, sometimes suddenly wanting to shut down, then it would run fine for awhile. Now this morning it simply will not start.


check to be sure you have fire to the plugs and also check to be sure you have fuel to the engine. Not sure what year you are working on but if you have fire and fuel to the injectors or tbi unit then check to be sure cat converter or muffler is not plugged putting back pressure on engine. If you put fuel in the tbi unit and it starts better go to the fuel pump.

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Idles, floods under acceleration/throttle movement


The TBI unit is going to be the route of your problem. Clean and inspect the insides of the unit. Next to the injector is the fuel pressure regulator. Either the injector pressure regulator has failed and is leaking, the o-ring that seals the regulator to the TBI has failed, or because of age and time. The housing itself has oxidized or cracked and is letting fuel leak into the throttle body. There are many different ways that the TBI unit can fail. An unmetered amount of air getting into the engine, low or no fuel pressure, or throttle linkage was sticking or broken, then there would be other symptoms. You provided a great description and list of symptoms. Please, when you have time, take a closer look at the TBI unit and let me know. If you have any other questions please write back and I'll do my best, good luck.

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Are the injectors getting power and a ground signal from the computer ?

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Feb 09, 2013 | 1993 Chevrolet C1500

1 Answer

No fuel to tbi/ changed fuel filter and turned on key and had a good fuel flowe from tank


could be a bad fuel regulator. these are built into the tbi unit where the fuel lines attach.

Mar 24, 2011 | 2000 Chevrolet Blazer

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Need help with this 93 astro van


Have you checked for injector pulse with a noid light at the injector connector? You could have a bad ecm.

Aug 12, 2009 | 1993 Chevrolet Astro

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90 chevy 350 with TBI starts but wont stay running changed fuel filter and fuel regulator dont know what next


I have a 90 chevy k1500 350 tbi with same problem! I have traced problem to... after turning on key fuel pump kicks on when u crank it over injectors shoot gas and truck starts! After few seconds injectors stop spraying and truck dies! This can happen many times over and over! Eventually sometimes truck stays running and all is great! I changed ignition module, oil pressure sending unit (which i was told controls gas after vehicle is running) fuel filter, computer, fuel pump relay, I am at a loss now! Hope this helps and hope someone can help me!

Aug 10, 2009 | Chevrolet C1500 Cars & Trucks

1 Answer

I am getting fuel to the tbi but it wont spray through the injectors please tell me what is wrong with it


Add techroline fuel injector cleaner and replace your fuel filter to increase the flow of gas to the injectors. You may need to repeat the cleaner until the injectors are clean.

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