Aluminum Fuel Cell/Tank crack repair

Do you need to have the crack welded or the hole?
If it is just the hole I would drill it out, slap a bolt on there with a copper washer on either side and call it good
Use to be , many years ago, u could put carbontetrachloride in the tank to wash it out and de fume it. A welder welded up a tank for me at 3 in the morning one time when I played dukes of hazard on a gravel road. I don't think a guy can buy it now , due to the EPA.
Oh, it was a 1963 Plymouth fury that belonged to my dad ! Had to have it fixed before getting home .