Question about 1994 Isuzu Trooper

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94 isuzu trooper turn key fuel pump runs for 2sec.and shuts off?

Not sure if my 94 trooper needs a fuel pump I turn on the ignition and the pump pumps out gas i only know this because i detached the fuel line right before the filter but after about 2sec. it shuts off. if i turn the key off right away and then turn it on the pump doesn't do anything unless I wait a couple of minuites then turn the key on. so I'm not sure if it's a bad pump or something in the ignition thats f**ked up and sending a signal back to the pump and shutting it off. What should I do first?

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  • Ryans94 Feb 24, 2009

    so were shoudl i start it ran fine a couple weeks a go and it will run if i hold the throttle to the floor but it seems like it's only running on 1 cylinder and i've had the coil packs tested and theyre fine so is it the ignition control module under the coil packs thats causing the problems if so how do i test it because the parts stores in my area are no help at all

  • mike loshbough
    mike loshbough May 11, 2010

    it is supposed to turn off after 2 seconds but if you crank it the pump will stay on



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Can you hear a click during that 2 secounds? Thats the relay shutting off the pump just what its suppost to do. The pump does not run contenuosly, if it did it would burn up, thats what the relay is for, it kicks on and off to maintain the correct pressure to engine as needed. It will not turn back on until it resets itself because engine was not running, thats the way there designed.

Posted on Feb 19, 2009

  • ccn7 Feb 19, 2009

    As i said the relay only kicks on when the engine needs fuel, its an on and off situation. Pump only stays on when the engine needs fuel to sustane the right pressure. Yes its supposed to turn off and then back on when its running, to maintane correct fuel pressure.



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