Device for preventing fueling error

A device for preventing a fueling error, which permits an insertion of a large-diameter relative to a nozzle insertion passage and blocks an insertion of a small-diameter nozzle relative to the nozzle insertion passage by using a difference in nozzle bore diameters depending on a fuel type for fueling by fueling guns which carry out the fueling to a fuel container, the device comprising:

• shutter members which can slide in a radial direction of the nozzle insertion passage and also can rotate, and due to a sliding movement and rotation, move between a blocking position blocking an insertion of a nozzle relative to the nozzle insertion passage, and a permitting position permitting an insertion of the nozzle relative to the nozzle insertion passage,
• wherein the shutter members include first abutting portions allowing the shutter members at least to slide and move by abutment of the nozzle whose bore diameter is a predetermined value or above, and second abutting portions allowing the shutter members to rotate up to permitting positions by the abutment of the nozzle, sequentially in a nozzle insertion direction relative to the nozzle insertion passage, and
• only in a case when the nozzle whose outside diameter is the predetermined value or above is inserted into the nozzle insertion passage, the nozzle abuts against the first abutting portions and the second abutting portions sequentially, so that after the shutter members slide and move for a predetermined amount to an outside of the radial direction of the nozzle insertion passage, the shutter members rotate and move in an opening direction, and move from the blocking position to the permitting position.