Mercury Pressure Tank

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  • May 3, 2026 at 9:14 am #317437
    Buccaneer
    Participant

      US Member

      Trying to get this pressure tank fixed up to use with my 1953 Merc Mark 15.
      Installed a new diaphragm, but the primer didn’t want to work good enough
      until I made a new discharge check disc valve. It still wouldn’t keep the motor
      running, as I think the tank isn’t building up pressure.

      I suspect the pressure relief valve and / or the gas cap seal.
      The graphics on the tank are still “decent”,
      so, I’d like to use the tank. anyone ever mount an OMC head on the Merc tank?
      Six of the eight bolt holes line up, but the last two on the end are about 1/16″ off.
      If a person made up a new “backer plate” to go inside of the tank, to match
      up with the OMC head, I think it would be a “go”.

      VIDEO…….
      https://youtu.be/rwFmSzjrOI4

      DSCN5352

      Prepare to be boarded!

      May 3, 2026 at 12:30 pm #317448
      RICHARD A. WHITE
      Participant

        Lifetime Member

        Can one elongate the 2 holes?

        http://www.richardsoutboardtools.com
        classicomctools@gmail.com

        May 3, 2026 at 12:41 pm #317450
        fastjohn
        Participant

          US MEMBER PAY BY CHECK

          You could put a Merc decal on an OMC tank.

           

          May 3, 2026 at 5:35 pm #317475
          Buccaneer
          Participant

            US Member
            fastjohn wrote:

            You could put a Merc decal on an OMC tank.

             

            I think that would be cheating worse than putting an OMC
            head on the Merc tank, lol.

             

            Prepare to be boarded!

            May 3, 2026 at 5:39 pm #317476
            Buccaneer
            Participant

              US Member
              RICHARD A. WHITE wrote:

              Can one elongate the 2 holes?

              The countersunk holes in the “head” body would have to be elongated,
              and that might be prone to leak, and not look too good.

              Otherwise, the aluminum, threaded backing plate inside the tank would
              need it’s two holes welded up, re-drilled, and tapped.

              Prepare to be boarded!

              May 4, 2026 at 5:58 am #317525
              RICHARD A. WHITE
              Participant

                Lifetime Member

                I have the Wizard version of this same tank….Needed new hose, of the unobtainium style. Until someone mentioned a fellah at Tomahawk had some of the right stuff…pricey but I have good hose again. It is for my Wizard Super 10.

                http://www.richardsoutboardtools.com
                classicomctools@gmail.com

                May 4, 2026 at 9:23 am #317537
                Buccaneer
                Participant

                  US Member
                  RICHARD A. WHITE wrote:

                  I have the Wizard version of this same tank….Needed new hose, of the unobtainium style. Until someone mentioned a fellah at Tomahawk had some of the right stuff…pricey but I have good hose again. It is for my Wizard Super 10.

                  I just used the new OMC dual line hose that I had.
                  I just changed out some of the fittings to fit that hose.

                   

                  Prepare to be boarded!

                  May 4, 2026 at 11:53 am #317547
                  T….in Wisconsin
                  Participant

                    US Member

                    Elton Duffy is to go to guy for gas tank information.
                    I justspoke with him this morning, he’s refurbing a 58 6gal Mile Master for me.

                    https://www.facebook.com/thegastankman/

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