No flaring the lines at all. I listed the PNs and pictures on the link above, heres the link, http://grandprixforums.net/fuel_line.php. Once you see them, you'll figure it out. Just make a nice, straight, clean cut and your good. As for draining the lines, I didn't. I just had a bucket handy for the excess fuel, thats it. Suck out the lines once you cut them, thats it really...