I have a small outboard motor with a split gas tank. The tank holds less than a quart.
I've repaired this by welding a thick plastic sheet (the sort used in plastic fuel cans) over the base of the tank so that it seals all the way round, making the tank gas tight again. Its an ugly repair, but I filled the tank with air to 30PSI and submerged it in water - no air leaks. I've given each side of the tank a good crack on the bench, re-filled it with air and still no leaks. Can I now consider this a safe repair?