I always use a siphon then when it is empty drop the tank to get the rest by removing the sending unit. You should be able to get a new gasket and locking ring, also a new float at the service dept.
I also go to a mom and pop tire store to get a couple of inner tubes from a truck like a 18 wheeler cut them to fit the straps od the gas tank along with the top of the tank for extra protection.
Hello and good morning.
You are to be commended for such an excellent idea!
I save my mountain bicycle tubes as they make the best rubber bands.
Boon
Postscript: What size are those mom and pop tires anyway?