Reply To: 1956 Johnson 30hp High Speed Tuning

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July 18, 2022 at 11:19 am #263134
frankr
Participant

    That pump is nearly as old as the motor itself.  The diaphragm may be petrified hard from age.  OR, there also was a bad version of the pump.  The “good” ones had real check valves, the bad one used diaphragm “flapper” valves.  Replacement parts are long ago NLA.  Replace the pump with a Sierra 18-7351.