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The immediate solution for the "rust in the gas tank" option are the accessory "filter screens" which are installed in the "top" of the gas tank shutoff valve - and which you have to have the tank empty before removing the valve to install the filter - which you simply "push" into the hole in the valve. The filter is surrounded by the fuel in the tank and rust stoppage is unusual but not impossible after installation.
An augmented version of this somehow uses a vacuum cleaner or magnet to remove loose rust while the gasoline level is down and the interior can be seen.
The more permanent solution involves removing the tank, filling it with square nuts and possibly blasting grit, and then rotating or jiggling the tank extensively while partly full of kerosene. There are various coatings one can use to limit further corrosion - each with various downsides associated with them.
The ultimate solution are specialist who cut open the tank, remove rust electrolytically or otherwise, and weld the tank afterwards.
Joe K