Re: Fuel Line Material
If there is a hidden spot you could just touch the line with a grinder to see if it sparks, that would tell you. Obviously, the SS will spark and the Al won't. The Al is softer than the SS so if you can devise some sort of scratch test. I would also think that an Al line would be a lot easier to bend than a SS line so if you could detach the line and try bending it in your hands that might give you an idea too. The magnet test isn't very reliable for testing SS as you don't know the makeup of the SS alloy and the chromium may mask the magnetic properties of the nickel and iron depending upon its concentration in the alloy.
'69 Z/28, Lemans Blue/White Stripes, DZ302, T56 Mag., 4.10
Dynatech, 17" VWW V45's 235/45, 275/40