>>The cause of most interior rust problems is from the tank losing its seal. It can be caused by degraded hose, connector O-rings, upper housing gasket, or bad/missing fiber washer fastener seals on the upper housing. Once the seal is lost, air gets inside, and with air comes moisture.
Thanks Aquasonic!
When done for the season, change the gear lube, take out the gas (link – https://youtu.be/GJ3KvTtSFNE?si=LTlpameNwJ6B55CW ), close the vent, close the fuel shutoff. Tubs
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.