Building a 1991 Kitfox 3 with the 13.5 gal. fiberglass wing tank. Has anybody had any luck using these or should I invest the extra bucks for the poly tanks. Is it even legal to burn Ethanol based fuel? I hate to spend the extra money but fibers or leaks is something I don't want. How about sloshing? How well does the 582 run on car fuel? Anybody have a source for replacement tanks. Its such a nice looking tank I hate to waste it. Wont the filter catch the fibers? "I need answers man!" please!