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1986 ASTRO 4.3 RUNS GREAT, BUT WON'T START WITH OUT A LITTLE GAS IN THE TBI

NEW FUEL PUMP, NEW FUEL FILTER, NEW BATT, FUEL RELAY GOOD, GOT 11PSI FUEL PRESS., HAVE NOTICED THAT I HAVE NO CK/ENG LIGHT WHEN I TURN THE KEY ON. CKECKED FUSES ALL GOOD.

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  • Cars & Trucks Master
  • 2,019 Answers

I believe the fuel pressure is too low. Think it is supposed to have 50 psi. If the return pressure regulator is leaking, that could keep the pressure too low, even with new pump.

http://www.partsgeek.com/v4f2jqh-chevrolet-astro-fuel-pressure-regulator.html?utm_source=nextag&utm_medium=pf&utm_content=mc&utm_campaign=PartsGeek+Nextag&fp=pp&utm_term=1992-1995+Chevrolet+Astro+Fuel+Pressure+Regulator+-+Standard+Motor+Products+PR484

Posted on Oct 31, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 356 Answers

SOURCE: 2000 blazer 4.3 hard to start (fuel problem)

Do you have the fuel tester hooked the in the overgrown air valve on the fuel rail in the back of the engine? Or do you have the fuel line unhooked in the back and hooked to the pressure pump? You want the fuel pressure to be in that 60 lb range so if you are hooked into the pressure valve on the fuel rail allowing fuel to go through, then I am betting it is the fuel pressure regulator. To get to that, you have to take the throttle body off and take the plastic plenum that covers the injector packs. On the back of the mount where your six pack of injectors are sits the pressure regulator. If it is faulty then it is dumping fuel instead of holding the pressure like it should.
Get a Chilton or Clymer manual and it shows you in pretty good detail how to fix it. I've done it to my 98 S10 with the same engine.

If you unhooked the fuel line so you are losing pressure from the line back to the pump then I would say your pump is letting fuel back to the tank when it shuts off. My money is on the first possibility though.

Good luck

Posted on Mar 28, 2009

emissionwiz
  • 75822 Answers

SOURCE: shuts off while driving. no fuel pressure. pcm fuse blows/ fuel pump relay inserted.

Sounds like the fuel pump is shorted.

Posted on Nov 03, 2008

  • 14036 Answers

SOURCE: Won"t start sometimes.

sound like fuel pump pressure low change fuel filter.if that dont fix it . probably fuel pump. if fuel pump good . get a scanner. because a bad coolant sensor cam sensor crank sensor . coil pack module could be bad.also bad pcm.

Posted on Mar 18, 2009

  • 159 Answers

SOURCE: 2000 Jeep Grand cherokee Laredo

sounds alot the the pcm it controls the fuel pump and ign system but the anti theft would keep it from starting because the key has a transponder in it programmed for that vehicle and that would kill all ign if triggered

Posted on Sep 27, 2009

  • 3600 Answers

SOURCE: 90 chevy k1500 350 tbi fuel problem starts but wont stay running

try bypassing the oil pressure switch on the back of the block behind the distributor, if there oil pressure switch goes bad it will do this. had one that drove me nuts trying to fix it then figured out I had to buy a book and low and behold thee it was 3 wire oil pressure switch you can't see between the engine and fire wall just behind the distributor and costs 8 bucks to buy new.

Posted on Jan 16, 2010

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