Question about 1994 Chevrolet S-10 Blazer

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Fuel pump failled instaled new fuel pump &filter,plus fuel fuel pump delivered 40 p.s.i. lasted 2 weeks then began to fail again,had to add raw gas to intake for start up then engine ran ok but eventualy it failled completly again so replaiced entire injector system &new pump wich developed 40 again but it failed's a 4.3 vortex engine,should the pump develop more pressure? p.s. u can hear the pump start inside the tank it still will not start engine

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  • robert john hammond Jan 20, 2011

    sent wednesday 1994 s10 blazer will only start by spraying gas into the air intake, see complete story sent wednesday19 of jan. please reply asap

  • robert john hammond Jan 20, 2011

    94 blazer s-10 installed new G.M. pump (51 psi) same problem vortex engine only starts when intake is gas sprayed then runs okay. Let sit 2 hours



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The fuel pressure should be from 41-47 psi. I always suggest buying genuine Chevrolet fuel pumps. This and thermostats are about the only two things that I suggest buying from the dealer. The problem that you are having is the reason why. Aftermarket fuel pumps are very bad about only lasting a very short time. Another very important thing is getting the filter on the bottom of the fuel pump correct. If the filter lets even a very small grain of sand or anything off of the bottom of the tank in the pump. It will ruin it. 40 psi will make the vehicle run. But from that, I would believe that you are running an aftermarket pump. I would suggest replacing with a Genuine part.

Posted on Jan 03, 2011

  • Rodney Clark
    Rodney Clark Jan 20, 2011

    If the truck runs when gas is sprayed in the intake then I would say that it is the fuel pressure regulator. It is letting too much fuel go back to the fuel tank.



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