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    civic8998's Avatar
    civic8998 Posts: 4, Reputation: 1
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    #1

    Sep 18, 2010, 05:28 PM
    89 honda civic intermintent fuel pump power
    My fuel pump gets power intermintely. Relay checks out fine.has spark.CEL and all other Dumbie lights go off normally after two seconds. Fuel pump is only a year old. I get 12.62 at the connector then drops to 10.35 a second later even when the fuel pump turns on it still does that. I've replaced my MAP sensor and igntion switch hasn't fixed the problem. I don't have a clue what the problem is any help would be greatly appreciated! Thank You!

    PS when I have more time I will get more information
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Sep 18, 2010, 05:33 PM

    This link may help:

    https://www.askmehelpdesk.com/cars-t...ml#post1245523

    Be sure to clean the main ECM ground, located on the thermostat housing.
    civic8998's Avatar
    civic8998 Posts: 4, Reputation: 1
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    #3

    Sep 18, 2010, 05:47 PM
    Hi TxGreaseMonkey I hope you would answer this I've been threw pretty much all your posts

    What topic should I choose in that link that you think would help me out the most? There are quite a few
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #4

    Sep 19, 2010, 05:23 AM

    In the link I gave you above, I would perform all of the tests listed--it shouldn't take too long.

    The contacts in the relay may be pitted. As the cross-sectional area erodes through pitting, the resistance goes up by a square factor. Based on the formula Area of a Circle = Pi x R-squared, as the effective cross-sectional area of a points gets cut in half, the resistance goes up four fold. This means that the amperage available to the fuel pump would be 1/4 of what it would be otherwise, when you plug these values into Ohm's Law. Ohm's Law states Amperage = Volts/Resistance. As resistance (Ω) doubles, amperage is cut in half.
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