There are two lines on the driver's side, a vent and a return line. The filler tube in the tank is not vented, but should have the restrictor in it for unleaded which does help vent when you're filling.
If the vent and return lines are that bad, you may have to replace some line anyway. I don't know the plumbing on the small Eagles, but on the big Eagles you have to drop the tank to really inspect the vent line.