Question about 1999 Dodge Ram

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99 dodge will not start

I have a 99 dodge ram 1500 when i turn on the key the fuel pump will not turn on but as soon as i plug my obd 2 reader it turns on the fuel pump and starts what could be the problem??

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  • cshsdances Mar 09, 2009

    i changed the relay

  • cshsdances Mar 09, 2009

    ok ill try that

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Check if there is voltage and ground at the fuel pump. I will take a guess that the ground will not be there, the fuel pump system is operated by the ECM (the engine computer) by grounding the fuel pump. Because when you use your obd2 reader it shorts the ECM to ground, maybe the ground to the ECM is bad. It is hard to say for sure but if does work get back with me and we can try other things

Posted on Mar 09, 2009

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Have u checked the fuel pump relay it should be under the hood.u should be able to jump out the relay and make the fuel pump work without the odd 2 reader. i think its posts 2 and 5 that u have to jump out.look on the side of the relay there should be a wiring diagram on it.

Posted on Mar 09, 2009

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  • 94 Answers

Bad fuel pump relay

Posted on Mar 09, 2009

  • lee cowan Mar 09, 2009

    my father in law had a similar problem and he called the dealer and they told him a series of things to do with turning the key off and on and pushing down on the acclerator its worth a shot to call the dodge dealer and talk to a service adviser

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