Replacing Fuel Line

Demon 408 said
Okay... are they stock? I've owned three stock 340 cars and none of them had 3/8 line from the factory.

The duster is fairly untouched except paint and I found it odd that it had it as well. I went to replace the line and 5/16 wouldnt go on so I tried 3/8 and it went on with as little persuasion