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1958 Johnson 5.5 Mikuni fuel pump problems

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  • 1958 Johnson 5.5 Mikuni fuel pump problems

    I have a 1958 Johnson 5.5 that I put a Mikuni pump #808492 on, and I am leaking fuel from the little copper colored disc on the top of the pump.

    1. Is there particular orientation that the pump is made to work in? Flat, sideways, etc...

    2. What is the little copper disc for?

    The pump can be seen here:

    808492 | eBay


  • #2
    Re: 1958 Johnson 5.5 Mikuni fuel pump problems

    Is this a new conversion? Or have you used the motor with the pump?
    give a man a fish, and he will eat all day. teach a man how to fish, and he will sit in a boat all day and drink beer.

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    • #3
      Re: 1958 Johnson 5.5 Mikuni fuel pump problems

      that disc is likely a smalll mesh to balance air pressure.... likely culprilt if leaking is a bad diaphram inside the pump

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      • #4
        Re: 1958 Johnson 5.5 Mikuni fuel pump problems

        Click image for larger version

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        heres a pic of a b&s pump mounted on a 7.5 johnson, the pulse line is obviously coming from a different location than it does on your 5.5, but for this pump, the top connector in the pic goes to the fuel in line, the bottom connector goes to the carb. if you are sure your lines are on right ( suck blow test), your problem could be as mentioned, a ruptured diaphragm.

        edit: the part # for the pump shown in the pic is 808656, so your lines may attach differently, but the suck blow test still applies.
        give a man a fish, and he will eat all day. teach a man how to fish, and he will sit in a boat all day and drink beer.

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        • #5
          Re: 1958 Johnson 5.5 Mikuni fuel pump problems

          The motor will run with this pump, but it is dripping gas through the copper colored disc. Stinks, because the pump should be brand new, off fleabay, so not worth returning.

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          • #6
            Re: 1958 Johnson 5.5 Mikuni fuel pump problems

            If it runs it has a bad diaphragm.
            Chris

            Top Secret Files:

            http://forums.iboats.com/showthread.php?t=299680

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            • #7
              Re: 1958 Johnson 5.5 Mikuni fuel pump problems

              I will swap out to another pump. Thanks.

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