Patent ID: 6966349

Claim:
A misfueling prevention device adapted to prevent an undesired fuel nozzle from being used to fill a desired fuel tank and to permit the filling of the tank by a desired fuel nozzle having a diameter larger than a diameter of the undesired fuel nozzle, the device comprising: an outer filler tube having an inner diameter; an inner filler tube having inner and outer diameters, the inner diameter of the inner filler tube defining a fuel passageway and the inner diameter of the outer filler tube and the outer diameter of the inner filler tube defining a space therebetween; and at least one support which supports the inner filler tube within the outer filler tube wherein the inner diameter of the outer filler tube and the inner and outer diameters of the inner filler tube are sized to allow the desired fuel nozzle to fit over the inner filler tube and to prevent the undesired fuel nozzle from entering either the fuel passageway or the space between the inner and outer filler tubes to prevent the tank from being filled with the undesired fuel.