Hey, no its not black its a metal line probably about 5/16" outer diameter. There are three lines that screw into the back of the carb, they look like those. The other 2 lines run on the drivers side of the engine, i dont think its a vacuum line. Its strange because i can't see any hose or nipple anywhere where this line could attach to!?
I'll try to get a picture of the fuel line if i can. It's pre shaped, so it seems like it runs to the drivers side of the engine and down where the other lines go, but theres nowhere to attach it.