Holley carb w/fuel leak - NCRS Discussion Boards

Holley carb w/fuel leak

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  • Robert F.
    Expired
    • March 1, 2002
    • 29

    Holley carb w/fuel leak

    I have a fuel leak from the Holley carb. We've replaced the gaskets, but the problem still occurs. The car is a '66 ragtop w/427/425, complete frame-off within the last 2 years (inc. engine). This car is new to me and I don't have alot of experience with it or big blocks in general. Any idea of what the leak problem could be?
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43221

    #2
    Re: Holley carb w/fuel leak

    Bob-----

    More than likely, the problem relates to a warped or otherwise distorted primary or secondary metering body or a distorted air horn assembly. Identifying the exact location of the leak will help narrow down the possibilities.
    In Appreciation of John Hinckley

    Comment

    • Patrick T.
      Expired
      • September 30, 1999
      • 1286

      #3
      Re: Holley carb w/fuel leak

      Joe is on the money. I went thru this exercise in April. Sometimes you can machine them true and flat and sometimes you can't. I had Jerry McNeish rebuild my original Holley 4160 and now it runs perfect and doesn't leak.

      Comment

      • Mike M.
        NCRS Past President
        • May 31, 1974
        • 8383

        #4
        Re: Holley carb w/fuel leak

        as joe relates, you need to isolate the leak source. if its the acceleator pump housing(common problem) then just remove it, and rub it on a piece of glass and sandpaper to remove the warp. if its at the metering block, its usually curable with new holly high-perf gaskets. mike

        Comment

        • Bill Clippinger

          #5
          Re: Holley carb w/fuel leak

          Bob - can you see where is the fuel leaking from? I'd try what the other guys have suggested, and check for any warpage between the many flat surfaces on your Holley.

          I used to have a recurrent leak with my Holleys at the fuel filter housing. I'd tighten it, and it would start leaking a few days later. It would be loose, so I'd tighten it again - same problem over and over. I finally replaced the gasket in question with a HOLLEY gasket rather than the "Joe Shmoe's Gasket Company" version that I was using at the time. I haven't had a leak since.

          Good luck!

          Comment

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