Hole in tank fix?

Concur-best to buy a new tank. If the rest of the tank is in good condition you can try and find a welder who will patch it. Old, bold welders usually fill it with water or blow carbon monoxide in...not many old, bold welders left for a reason!(lol)...most guys won't mess with it and O don't blame them. Lot's of horror stories of sealers getting in the fuel and causing problems. Once rust starts on the tank I think your in for an uphill battle. New tank your best option IMO. Good Luck!