Question about 1999 Chevrolet S-10 Pickup

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Good fuel pressure. engine turns will not start. runs if primed through trottle body.

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  • mike loshbough
    mike loshbough May 11, 2010

    WHAT IS THE FUEL PRESSURE

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Determine if you have enough fuel pressure coming from the fuel pump. sometimes a failing fuel pump can preoduce enough pressure to run the vehicle but not enough to open the fuel injectors unless primes through the air intake. also if the fuel pressure regulator is going bad you would smell fuel coming from the top of engine after it has been shut down for a few hours. this is due to failure .

Posted on Jan 23, 2013

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Replace the fuel pressure regulator in the intake plenum. This is the No. 1 problem for hard starting with the 4.3 L engine. It leaks fuel and loses fuel pressure when sitting for a few hours. You can try to cycle starter for a split second without cranking wait 3 seconds the turn key OFF then repete 3 times then tryto start. This will build up lossed fuel pressure and verify leaky fuel pressure regulator. Joe ASE Master Tech

Posted on Mar 05, 2009

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The crank sensor is a good candidate. Pretty common failure on jeeps.
To clarify, the fuel pump is on all time during engine cranking, and during engine running. When the engine cuts off, the pump will also be stopped. But, you will not lose pressure in the fuel lines and fuel rail immediately. The check valve in the pump is supposed to hold fuel pressure in the system for a good time-about 20 minutes. The pressure should bleed off very slowly.

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4 Answers

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