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Fuel Pump Rewire Relay Diagram for DUAL in tank pumps

Posted by 1990TSIAWDTALON, Apr 26, 2016

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    1990TSIAWDTALON Moderator

    Joined Nov 14, 2013
    Independence, Kansas
    Dual intank pump wiring use one fuse 30 amp in hot wire diagram.jpg

    Here is a short write up on how to run DUAL in-tank pumps and should be a big help to those that need a little assistance.

    This diagram has the pumps "HOT" at all times and uses the ground to turn the pumps on.

    Not all systems will use this way to activate the pumps so understand that EVERYTHING on this circuit is HOT, not the typical switching the hot for power but switching the GROUND for them to operate!
    I want to make this perfectly clear!

    Now that that is clear, on with the specifics:

    86 is the power for the relay to work
    85 is its ground so that the relay functions
    30 and 87 are the switching poles of the relay for your pumps to see ground and come on so they can be turned around since they don't care which one goes to your pump grounds and which one goes to the cars ground.

    For Dual Walbro 255’s, it looks like the maximum amp draw on one is 9.8 at 50psi and 13.5 volts so I'd say a 30 amp relay should be fine, if I had a choice for a 40 amp relay I think I would run it just so it doesn't see much of a pull on it, like half of what it is rated for. I got that information from this link here:


    A fuse should always be used BUT....if you are thinking of running two fuses, if you blow one, your car will run lean which could spell disaster so check out this thread from a SRT site:


    So after reading that I would use ONE fuse for both pumps that way if it blows, you will know it rather than run lean and not know one has a blown fuse.

    Thanks go to bOOstedtalon2 for the diagram and srtforums, autoperformanceengineering and DexterHolland for their contributions to this article!
    Last edited: Apr 26, 2016

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