Fuel line tubing

[retired1]

Does anybody know why copper tubing is not used for fuel line? Or is it! After all they use plastic and soft aluminum.

[mknittle]

It tends to work harden after time and crack.and this happens

[mr48chev]

Mkinttle pretty well nailed it. in places where the line might flex a bit copper tends to work harden and eventually crack. It will pass for short runs where you have no vibration but to me running copper tubing on a fuel system says that the person who did the install didn't have the skill or ambition to properly install steel tubing.

The plastic that is used on a lot of later model cars is a special plastic that handles the pressure and if you take a good look at the aluminum fuel lines on most late model cars it is mounted so there is no vibration. The aluminum fuel rail on my wifes mini van crapped out and a P/O replaced it with a length of FI rated blue rubber hose.

[mknittle]

when my dad bought his 52 pererbilt there were still some copper air lines and that was a big problem. LOL then came aeroquip and now plastic.

[Atomsplitter]

I used the Nylon lines from the '95 Impala SS donor car, they just click together!