Question about 1989 Chevrolet S-10 Blazer

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1989 Chevy S10 Blazer won't start unless I pour fuel in the TBI.

My 1989 Chevy S10 Blazer 4.3L won't start. When I try to start it, no fuel comes out of the injector nozzles (I verified this by holding a paper under it).
If I pour some fuel directly into the TBI, it will start up but immediately die as it runs out of fuel.

I already replaced the Fuel filter, Fuel pump and Assembly (sending unit), cleaned out the gas tank and put 7 gallons of good fuel in there.

I think the fuel pump is pushing fuel up to the TBI, because I think I hear the pump turn on, and when I disconnect the hose by the TBI now, fuel is present (when it was only air in there before).

I think the injectors are getting the right electrical signals because when I test with a test light, one side lights the light constantly when I ground it, and the other side flickers dimly when I connect it with the battery and attempt to start.

I think the fuel relay works because when I hold my fingers on it and have my friend attempt to start the car, I can feel the relay click inside.

No fuses are blown and there were no trouble codes.

I don't know what else could stop fuel from coming out of those injectors. There must be something I'm missing.

This car has sat for years so I imagine anything could be broken on it.

Is there anything else I can test? Thanks!

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Fuel pressure regulator. It regulates the fuel pressure you receive going to the injectors. All the injectors would not be bad, so you have to take a step back to the next component, which should be the regulator.

Posted on May 03, 2010

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  • 4 Answers

Is there a security light on? if so it may be the culprit behind no fuel going beyond the injectors truck may be in security mode

Posted on Apr 08, 2014

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Posted on Jan 02, 2017

  • 180 Answers

SOURCE: I have a 1993 chevy s10 4.3l TBI that will not start.

Make sure the injectors are pulsing. Whatch to make sure mists oj fuel are coming out.

Posted on Apr 01, 2010

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Make sure the injectors are pulsing. Whatch to make sure mists oj fuel are coming out.

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89-98 chevy blazer


It's not worth doing all that conversion, buy the time you spend the time and money to convert the 89 4.3 to work on the 98 blazer, it would be cheaper to install a 98 vortec rebuild. The 89 4.3 have a TBI fuel injection system and the ecm on the 98 will not work and the bad news is that the ecm on the 98 also controls the transmission shift points and the 89 will not, so even if you swap the ecm to have the 89 4.3 engine work. the transmission will not shift. Sorry for the bad news but it would be cheaper to replace the 98 engine with the years of 1996 to 2001. Good luck and hope this helps. 

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