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Thread: Blowing fuses trying to install Electric fuel pump.

  1. #1
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    Default Blowing fuses trying to install Electric fuel pump.

    Hi guys, I have a 72 240z, I have a carter 2-4 pound pump installed and ready to go at the back of the car. but I've run into a hitch.

    When I try to close the circuit with an inline fuse (left of the fuse box, green/black wires that were taped to the harness with blue tape) it blows the fuse when i turn the ignition on.

    The pump works fine when wired direct to power. so I have no idea what is going on.

    When i check the plug that was secured with blue tape with a volt meter, it read's 12.2 volts. as I understand it, this should not be a grounded plug, it is supposed to carry power from the black wire to the green wire with a fuse.

    Am i missing something here? my car wont go till i get this figured out!

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    Well I just ran my own wire from the black/white wire on that plug to the positive on the fuel pump, it's working now.

    Only explanation i can think of is that the green wire going to the rear pump wiring was shorted somewhere.

  3. #3
    Registered User beermanpete's Avatar
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    What is the fuse rating that blows?

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    Registered User Jarvo2's Avatar
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    Sounds like a short in the OEM wiring that you're using. Here's how I wired up the electric pump in my '72...

    Dave's 1972 Datsun 240z: Electric Fuel Pump Installation
    Dave
    Windy City Z Club (Chicago)
    1972 240z, restoration in progress
    http://jarvas240z.blogspot.com

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    thanks, i ended up bypassing the stock green wire from under the console and running my own from the black/white wire. on the plug.

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