Because vibrations will work harden and break the copper very quickly as compared to other tubing/hose materials. It's easy to see yourself...take a piece of copper tube, bend it back and forth a few times and watch it tear/break. This is why you don't/can't use it for brake lines.
OK answered my question. I didn't know if gas would have adverse effects on it or not. It will run the frame channel, and will have rubber hose at each end, so I think I will be OK. Thanks
For racing and street we use 3/8, 1/2, and 5/8 soft
alum line, all the time with no problems. Its works well for use
in frame rails, easy to bend with spring bender or by hand. You
can use with rubber or AN ftgs. Usually comes in 20 or 25ft.
Hopes this helps. If you need some I have it stock.
Biggest reason I wanted to use it, is because I already have it. Where it will mount will be out of the way. It's just a DD type truck, so not really worried about it getting pinched.
I'd think you could just use rubber to go inside your mounting straps to keep it from vibrating and getting a hole in it. My buddy is going through the same thing with his '49 plymouth. the fuel lines were so rusty that when he hit them with a wire wheel while cleaning the frame it cleaned a hole in the fuel line. Every one we talked to said to use brake line of the same size. It's not very expensive at carquest. Just a thought.
I would never post a suggestion that I have never tried,
and the alum. I'm talking about is specifically designed for fuel
lines. Check Earl's, Russell, Summit, Jegs, etc. they all make
and sell this type.
I recommend 1.5" radiator hose for anything bigger than a 4 cylinder..........dont want to starve that engine!
I think you will be Ok with the copper, just check it periodically. Ive seen guys run grain alcohol through copper tube coiled up inside 55 gallon drums filled with ice....oops.....
I didnt see anything, really......