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Most auto parts suppliers sell a two part epoxy stick that is designed to fix gas tanks. You twist together and stick in the hole, I have fixed two gas tanks with this and it worked both times. One of of repairs was done in freezing tempature and it worked. It only cost about $3.00 for the epoxy stick.

I've used this stuff. Tank doesn't need to be dry or empty. Wipe off the leak and immediately put the epoxy on it. Don't mess around with the epoxy too much after you put it on since that will cause it to seep around the epoxy. Then you will have to start over.