I type too slow. Below is my response which says the same thing as Av8r3400. Only thing Av8r3400 beat me to the post. Oh well. I'm posting anyway as it represents 10 minutes of work that I don't want to delete.

What about someone making tanks out of METAL?
Skot- many a thread has been dedicated to the "why not aluminum tanks" subject here and on several other Kitfox/Avid sites as a cure for the alcohol problem associated with older fiberglass tanks.

Problem is. They don't work. Many have tried all the way back to the early Avid and Kitfox models.

The fuel tanks are a structural element of the Kitfox wing. They are glued to both the front and rear spars. The fiberglass tanks will bend/give with the flexing inherent in our wing design. No problems. No leaks, usually.
Aluminum tanks will not accept the continuous bending loads induced during flight and will break at the welds leaking fuel into the wing. Not a desirable situation which results in much time and labor to replace the aluminum tanks.