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Thread: Holley 750 Ultra

  1. #1
    Join Date
    Feb 2017

    Default Holley 750 Ultra

    I was wondering if I screwed up something. I haven't started my truck in a while, and the other day I went to hit it. It backfired in the carb and a flame came out like it was flooded. I turned the fuel pump back on and cranked it but, it started running real rich. Can anyone give me maybe a idea of where I can go from here on this situation? Thank you for taking time with me on this. Kenny

  2. #2
    Join Date
    Nov 2014
    Ont. Canada


    You could have popped the power valve. It's got a little rubber diaphragm in there. Then vacuum will pull fuel through it and into the plenum.

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