Abstract: A fuel dispensing apparatus for automatically discriminating a sort of fuel in a fuel tank of a vehicle in advance of fuelling, by sucking the fuel vapor in the tank into a chamber provided on a fuelling nozzle and accomodating a gas sensor for sensing the vapor introduced into the chamber. The nozzle is further provided with an air ejecter having a base port communicated with an air supplying means through an air hose, a top port for ejecting the air from the base port toward the atmosphere when it is opened, and a side port connected with the gas sensor chamber. A valve body is movably arranged in the nozzle and moved in a forward direction by a nozzle lever and in a backward direction by a pressure of fuel supplied to the nozzle so as to open and close the top port of the air ejector.