A friend of mine salvaged this coil of 3/8" Flexible Copper Pipe from the Dump. Looks as if something fell on it and damaged most of it, but hey, I got a twenty foot section out of it that was still good, and more than enough to plumb the Fuel Lines of the Opel GT in.

Flexible Copper seems to be the perfect thing to plumb Fuel Lines, easy to match the contours, twists, and bends of the old line..

Double Flaring the ends just for that added extra strength in the seal.