Question about 1997 Isuzu Rodeo

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My fuel pump dosen't work all the time and i just replace it.

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  • shyspeed May 11, 2010

    earth problem?

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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.

Posted on Mar 06, 2009

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