A fuel filling neck includes a closure flap pivotably mounted thereon to be pivoted between a neck closed position and a neck open position. The flap is preloaded into the closed position by spring pretension. A mis-filling prevention device is in the filling neck between the closure flap and an insertion opening for a fuel pump nozzle and has a closed position that prevents the closure flap from being pivoted into the open position, and an enabling position permitting the closure flap to be pivoted into the open position. The mis-filling prevention device is mounted with axial play so as to be first axially forced against the closure flap by the fuel pump nozzle as the nozzle is inserted, the closure flap being moved into a partly open position, and, during subsequent further insertion of the nozzle, the mis-filling prevention device being moved into the enabling position.

An object is to suppress excessive insertion of a fueling nozzle during fueling. A nozzle guide configured to form a nozzle guide path that guides a fueling nozzle is placed inside of a filler neck main body configured to include a fuel passage that introduces a fuel supplied from the fueling nozzle toward a fuel tank. This nozzle guide comprises a first projection for nozzle restriction provided on a nozzle guide end opening portion at an end of the nozzle guide path along a nozzle guide direction and protruded from an end opening circumferential wall of the nozzle guide end opening portion to narrow at least part of a diameter of the nozzle guide path; and a second projection for nozzle restriction provided on a downstream side of the first projection along the nozzle guide direction and protruded from the end opening circumferential wall to narrow at least part of the diameter of the nozzle guide path.

A fuel inlet assembly for an automotive vehicle having an elongated tubular and cylindrical housing open at each end and defining a port in between the ends of the housing. A flapper valve is associated with the fluid port and is movable between an open and a closed position. At least two latches are pivotally mounted to the housing adjacent the fluid port and movable between a latch position and a release position. The latches engage the flapper valve to prevent the flapper valve from moving to its open position. A flexible bump is attached to each latch so that the bump pivots with its associated latch and each bump protrudes radially inwardly from its associated latch. Each bump has a cam surface which, when engaged by a fuel nozzle, pivots the bump and its associated latch to the release position. However, the latch is collapsible in a radially outward direction towards its associated latch when that latch is in its release position thus enabling a fuel nozzle to pass past the collapsed bumps and engage the flapper valve. As such, only a fuel nozzle with a predetermined size range will engage the bumps and pivot the latches to an open position and also allow the fuel nozzle to pass the bumps and extend through the fluid port.

A misfuelling prevention device for preventing inappropriate fuel from being added to a vehicle utilizes a diameter difference between a gasoline gun and a diesel gun in order to prevent misfuelling. The misfuelling preventing device is constructed such that when the diesel gun having a relatively larger diameter is inserted, a locking button is not pressed while a flapper is opened, whereas when the gasoline gun having a relatively smaller diameter is inserted, the locking button is pressed while the flapper is not opened. As a result, misfuelling of the vehicle with inappropriate fuel is fundamentally prevented.

A nozzle inhibitor is adapted to be arranged in a filler neck included in a fuel-tank fill tube and is configured to allow only a diesel fuel nozzle having an outer diameter that is greater than a specified minimum diameter to be inserted into the fill tube to a depth sufficient so that a user may dispense diesel fuel from that nozzle into the fill tube. The nozzle inhibitor inhibits insertion of a small-diameter unleaded fuel nozzle into the fill tube, yet allows insertion of a relatively larger diameter diesel fuel nozzle into the fill tube so that only diesel fuel is dispensed into a diesel fuel tank coupled to the fill tube.

This invention relates to a urea tank having a filler neck, an inlet adapter and a filler cap. While a filler cap is mounted on a filler neck, a locking piece is rotated 135 degrees, and then the filler cap is pulled upward.; as a result, the filler cap is removed from the filler neck along with an inlet adapter. While the filler cap is mounted on the filler neck, the locking piece is rotated 90 degrees, and then the filler cap is pulled upward; as a result, only the filler cap is removed from the filler neck.

A device is provided to prevent the accidental introduction of an incorrect liquid into a tank, such as the introduction of gasoline into the fuel system of a diesel fuel container. The device discriminates between nozzle diameters, allowing entrance of nozzle diameters at or greater than a predetermined minimum diameter while inhibiting entrance of nozzles having diameters less than the predetermined minimum diameter. A closure mechanism prevents access to a fuel container interior and a releasable locking mechanism responsive to nozzle diameters allows the closure mechanism to open and close to allow access to the fuel container interior.

A fuel filling aperture opening and closing device includes a closing member turned to an open position to open a fuel filling aperture by an introduction of a fuel filling nozzle. The closing member is provided with a flap member having a ring-shaped seal member, and an urging device urging the flap member to be positioned at a closed position. The seal member is provided with seal portions respectively inside and outside, and one of the inner and outer seal portions is a plate-shaped portion pressed by the urging against a projection piece bordering an opening edge portion of a pass-through opening of the fuel filling nozzle, and the other of the inner and outer seal portions is formed by an inside circumferential projecting portion and an outside circumferential projecting portion respectively pressed against the flap member.