X2 fuel lines

[x2]

I just put all new fuel lines on my 1987 X2 and I have a couple of questions one there are four tubes coming out of the fuel tank. one is a vent than a on and a reserve and a fourth and I can't remember what it is for? also what line is my fuel return line?

[Technical Support]

The 4th is the return - the top line from the carbs.

[x2]

THANKS