I came across the site below and thought I'd share it with you guys. It's a pretty good article on making both single flares (fuel) and double flares (brake lines) on tubing. Arguments about which level of quality (of flaring tool) will continue as long as tubing is around. Regardless, the less-expensive falring tool is used in this article. http://www.joesfalcon.com/gentip2/gentip2.html
Good article, if only i could make it look that easy. For some reason my tubing always squeezes past the clamp instead of flaring...probably just my luck though.