Can someone identify this line for me?

[bigred_s13]

Just bought an s13 240sx with an sr20 swap and im a little out of my zone identifying some lines in the car, mainly this one which runs to the back of the car but for some reason in the engine bay it runs up in front of the air filter and is not attached to anything at all, anyone able to help identify it?

[e1_griego]

It's the vent line that runs from the gas tank to the charcoal canister.

Also, use the "Identify this" thread next time.

[Drifting Kalamari]

goes from fuel tank and to a charcoal canister for fuel vapors, IIRC.

[bigred_s13]

Had a hunch it was one of the three fuel lines, thanks and sorry about that, ill make sure to post in the right place next time im just pretty new at this