There's a couple of different solutions you could take here. The first would be to take the car to a shop and have them fix the really rusted section of the line with some rubber hose or something. I don't think they will patch up the line with the metal. The problem with patching it though, is that the entire fuel line likely needs replacing. And if the fuel lines need replacing, the brake lines are soon to follow. When removing the fuel lines, it's quite likely you will agitate the rusted brake lines, and they will start leaking.... so brace yourself for that. The second approach is to replace the entire line. I am currently replacing fuel and brake lines. I ordered fuel line from Lines-to-Go. They are not expensive, and come in 2 sections making them easy to install. That being said, install isn't the easiest but not the worst. I would gauge it at 6/10.
The lines take a week to arrive, free shipping from Canada:
https://www.linestogo.com/
Brake lines from Classic Tube. They arrive in 2 weeks:
http://www.classictube.com/
