On Feb 4, 10:37 am, wrote:
Can someone point me on how to build a fiberglass fuel tank and use
aluminum fittings?

Thanks
Bill

You might get some hints from various sections of my web site.

www.kisbuild.onfinal18.com

There are several examples of the fittings on the wings of both the
KIS Cruiser and the TR1. The main thing you need to do is bond in
aluminum hard points on the inside of the tank for your fittings to
connect. Pre-tap the hard points threads to keep any shavings from
getting inside the tank.