Question about 1994 Isuzu Trooper

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Got a 94 trooper that will not start unless its on starter fluid.

Replaced the fuel pump there is fuel in the rail. will run after starting fluid runs out but have to pump it and it doesnt run good

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  • Cammy Cullen
    Cammy Cullen Dec 31, 2008

    dont know how much presure is i n the rail it dribbs out when you press the bleed valve. has a new felter and new pump. where is the bad check valve

  • Cammy Cullen
    Cammy Cullen Dec 31, 2008

    any ideas on what can cause the fuel presure tobe low

  • Cammy Cullen
    Cammy Cullen Dec 31, 2008

    yes i am a tech jut dont have the right tools for thhis job

  • Cammy Cullen
    Cammy Cullen Dec 31, 2008

    any other ideas

  • Cammy Cullen
    Cammy Cullen Dec 31, 2008

    yes you can hear the pump. where is the roll over switch at

  • Cammy Cullen
    Cammy Cullen Dec 31, 2008

    K DO YOU HV ANY OTHER IDEAS

  • Cammy Cullen
    Cammy Cullen Jan 01, 2009

    k so there is enough pressure in the rail and tried a new fuel pump n filter and it still wont start any more ideas

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How much about will it cost to replace a fuel pump

Posted on May 29, 2009

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How much pressure is in the fuel rail? It sounds like a weak pump or bad check valve. If your lucky though it could be a clogged fuel filter. Let me know what you find.

Posted on Dec 31, 2008

  • 3 more comments 
  • David Robinson Dec 31, 2008

    In the pump. The fuel should spray out not dribble. It should be around 35 psi.

  • David Robinson Dec 31, 2008

    I have replaced fuel pumps that lasted 5 minutes or 5 days. If the pump has a warranty then replace it.

    It is possible that the fuel tank had junk in it and clogged the fuel pick-up screen so if you remove the pump check that first.

    Did you replace the pump yourself?

  • David Robinson Dec 31, 2008

    Well, you have no fuel pressure. It's a fuel delivery problem. Just maybe the roll over switch tripped. Can you hear the pump running?

  • David Robinson Dec 31, 2008

    If you can hear the pump the rollover switch is ok. The switch cuts power to the pump. On Troopers the switch should be under the hood on the drivers side. It should have a round button usually red or yellow. You push on the button to reset it.

  • David Robinson Dec 31, 2008

    You can try to disconnect fuel line from fuel rail and at filter and blow it out with compressed air and then reconnect and try again.

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