RE: Fuel Tubes Function???
Its kind of like a fuel pump.Your pipe creates some back pressure to be pushed through the line to the the top of your tank and pushes your fuel out the tank in your other line to the carb and motor itself.And usually if you are getting unburnt fuel or excess oil coming out of your pipe while running this means your carb needs some full throttle passes to clean the excess fuel out or it is set to rich.