I know someone that works at a chemical supply place, and I have gotten about six 5 gallon plastic jugs that were originally meant for very strong hydrochloric acid. (although they were never used) I was just thinking today, one or two would make a perfect gas tank for my outboard. Does anybody know if it would be legal for me to do this? Both filling at the pump, and having on board my boat? Or must they be approved by somebody?