Jocelyn Dockham

I noticed a steady spurting type of leak near the gas tank, and I know it's not my fuel line, because I checked around it. It seems to be coming from a very corroded line right above the three fuel lines that are close to the fuel filter. I can't seem to follow it towards the back but it sorta goes along the fuel tank. Anyone know what this line is for and maybe how to replace? I don't know if I'm explaining this right.