Question about 1996 Isuzu Rodeo

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No power to fuel pump 1996 isuzu rodeo

I have no power to the fuel pump after a guy ran all the fuel from the tank in a 1996 isuzu rodeo. i have checked the relays and have ground and some power. not sure what to look for next?

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  • John Mar 05, 2009

    mines a 95 and have the same problem. i noticed if i removed the neg bat cable and let it sit for about 20 mins and hook it back ( reset the ecm). that it restores power to the pump. i have been told it could be a bad ecm. am putting newcomp in it tommorow will let you know how it goes.

  • davejsr1963 Apr 24, 2009

    i have a 1997 isuzu rodeo with no power to fuel pump and no power to 20 amp fuse in fuse box also only get power on one post on fuel relay



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Well i got a salvaged ecm from a junkyard and put it in, still did'nt start. took alternator off to have it checked , it is fine. put it back in and now it starts and runs fine. check the alternator and the connections, i heard the alternator controls power after the initial ecm prime when it is turned on. i have no idea how true it is, but worth a shot. if you can find a cheap ecm for a junkyard (mine was 75 bucks) i would try that afterwords.

Posted on Mar 06, 2009

  • John Mar 06, 2009

    just found this info also:

    There are 2 connectors on the alternater. The
    round one has 3 wires. If there is no voltage on the green wire when
    the engine is running the alternator is bad. I'm not sure what fails
    internally but the alternator can put out fine charging voltage on the
    main black lead and not have voltage on that green wire. That wire is a
    trigger for the fuel pump relay. Voltage goes to the main power relay
    then to idiot lights in the dash then back to trigger the fuel pump
    relay. Along the way it goes in and out of the oil pressure
    switch(sender at the back bottom of passenger side of block with 2
    yellow wires). This switch cuts voltage to fuel pump if no oil
    pressure. The green wire from alt is a safety in case of collision ect.
    Engine not running> no alt voltage on that wire>no fuel pump
    pressure>no fire. If this wire is bad it will not show up on the
    standard auto store test. And is a common failure. I had an brand new
    Isuzu rebuilt OEM alternator that was bad like this.


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Try tracing the fuel pump power wire from the tank back toward the engine. I've had a few Isuzus with corroded wires.

Posted on Feb 06, 2009


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