1955 Mercury Mark 25 fuel pump

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  • September 18, 2017 at 4:14 am #8262
    cheetahgod
    Participant

      The bottom 3 gaskets are the old ones that came off the motor.
      The top 4 are the new ones that came in a pack.
      Is the fuel pump supposed to have this extra gasket?

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      September 18, 2017 at 12:10 pm #65078
      mercuryspecialist
      Participant

        Jason, the Mark 25 does not utilize the fuel pump cover, to typically, cylinder block gasket pictured on the left. Do note however that the screw holes in the diaphragm and gaskets on each side are eccentric (as you placed them for the picture, the two gaskets for each side of the diaphragm have their holes in the opposite direction as to the diaphragm), when some do install the diaphragm or gaskets backwards, they "bunch-up" and can create a leak: and if the application does use the cover gasket, the pulse holes do not align with the cylinder block pulse holes, and the fuel pump does not function.

        Regards,
        Joe

        September 18, 2017 at 10:19 pm #65093
        cheetahgod
        Participant

          Pictures

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