Gas Line

The normal one is steel. The vendors sell them. The copper one will eventually break due to vibration.
 
When you say "normal," that would be an aftermarket product. Original gas lines were plated steel, I believe. Early Model T lines were brass.
 
And as an aside, the vacuum line from the intake manifold to the firewall should also be steel, same reason - reduce susceptibility to vibration. Not really a safety issue, but if that vacuum line fractures your car will run poorly. So suggest you get a new vacuum line as well. Of course, if you don’t have a vacuum line (electric wiper motor, although a ‘31 should have a vacuum wiper motor) ignore the above.
 
Copper work hardens from the motion of engine vibrations. As the copper work hardens, it becomes brittle and prone to cracking. The original Model "A" gas line was rolled steel, so it has a seam along its length.
 
60 years ago, while touring Sequoia National Park in my coupe, the seam came loose and the fuel line started leaking gasoline. The gas station made up a new line and installed it for me. I had to wait a while so that the service station attendant could help other customers with higher price needs. Remember service stations?
 
nkaminar said:
Remember service stations?
Click to expand...

My first job was at a service station and I learned a lot from the old boy who owned the place. Gas Stations didn't make much off of selling gas, so they had to supplement their income with working on cars. We became life long friends. He also had the local contract with AAA towing
 
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