Reply To: OMC Pressure Tanks

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February 25, 2026 at 5:24 pm #305027
Buccaneer
Participant

    US Member

    Regarding the diaphragm with the extra big hole, it may have been
    for an “under-pressure” valve, as explained by the article I just
    stumbled upon in my files.

    1951-1952_johnson___evinrude_gas_tanks

    Prepare to be boarded!