Fuel Vapor Recirculation Tube (Duratec engine only)
WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
The fuel vapor recirculation tube connects the fuel tank to the fuel filler pipe and allows recirculation of the fuel vapor from the fuel tank through the filler pipe with the dispensed fuel during refueling events. This reduces the volume of fuel vapors requiring storage in the EVAP canister.