1992 Chevy Astro tbi problem

Tiny
MIRUSS
  • MEMBER
  • 1992 CHEVROLET ASTRO
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 15,800 MILES
I replaced the pump with an a/c delco replaced filter and took throttle body off and rebuilt it and injector plate so everything is clean and rebuilt the vehicle runs great actually when it runs my fuel pressure right where it should be 13-15 lbs by the way te tbi was filthy I hve given it a complete tune up and since then I pulled a couple of plugs and they are firing correct so now that the histoy is done my problem is that it starts and runs greatit will run anywhere from 20 minutes to 3 days then it stahls I get spark but what happens is that no fuel is getting to the injectors and it always does it where I cannot check fuel pump but after anywhere from 10 to 30 minutes it will start right up and runs great I have been in a car wreck over 3 months ago and need to see doctpr couples time a week and have not been able to last 3 weeks for my injections this is our only car now and I am at a lost what the problem is so any suggestions would be appreciated and I cannot afford to pay for the help thanks russ
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Sunday, October 11th, 2009 AT 10:47 AM

4 Replies

Tiny
JDL
  • EXPERT
I can't tell you exactly what the problem. You WILL have to test when problem occurs. There is an oil pressure switch in fuel pump circuit, once you crank it enough to bring up oil pressure and the switch closes, the pump should run regardless of pump relay, that switch will not kill the pump or keep it from starting as long as the relay circuits are functional. There is also a prime connector, shows to be close to relay, passenger side firewall, it's an electrical connector, nothing plugged into it, wiring color red or possibly gray. If you use a jumper wire, run battery voltage to connector, the pump should run, use inline fuse. Did you check for codes? On some systems, the computer monitors the voltage on the fuel pump circuit, if no voltage when there should be, a code sets.
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Sunday, October 11th, 2009 AT 11:09 AM
Tiny
MIRUSS
  • MEMBER
Thanks for suggestions but I have checked all the sensors but I have not checked the bypass idea but like I said it starts easy and quik when it does start does any one think it could be a vapor lock and if so how would I check or a vacuum problem which I don, t think vacuum is problem cause it does run smooth
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Sunday, October 11th, 2009 AT 11:32 AM
Tiny
JDL
  • EXPERT
Right now, I can't tell what your losing for sure? How long since a tune-up?
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Sunday, October 11th, 2009 AT 12:26 PM
Tiny
MIRUSS
  • MEMBER
It was tuned up about 1.5 months ago or about 1500 miles I just checked the vacuum hoses at the purge cannister and ther was nothing what so ever no suction or pressure is this normal
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Sunday, October 11th, 2009 AT 12:51 PM

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