What is this tube?

[e635815]

Black plastic tube running from passenger well (cable tied to the chassis) to the front of the car, underneath the radiator and then, disappears in the pilot side front wing?
Any idea?

[Pink_Floyd]

It goes from the tank breather to the carbon canister in the wing.

[e635815]

So, must not be removed in search of improving lightness.....
Thanks for the answer.