Methods and systems are provided for nozzle guides for vehicle refueling adapters. In one example, a nozzle guide includes a plurality of protrusions adapted to center a fuel nozzle within the nozzle guide and to reduce a likelihood of over-insertion of the fuel nozzle into the nozzle guide. The nozzle guide may include features such as a rear guard and upper wall adapted to reduce ingression of liquid fuel with fuel vapor flowing from the fuel tank.

A fuel filler device for filling fuel into a vehicle tank, includes a filler pipe for receiving a fuel filler nozzle, which filler pipe can be connected with the vehicle tank. At least one pivotably mounted closing flap is arranged in the filler pipe. A spring element is provided, which biases the at least one closing flap into a closing position closing a passage through the filler pipe. The at least one closing flap is pivotable from the closing position into an opening position opening a passage through the filler pipe as a result of the fuel filler nozzle inserted into the filler pipe. At least one valve element forms at least one bypass to the at least one closing flap, and from a limit pressure difference, allows a passage of gas out of the filler pipe and/or into the filler pipe.

In a fuel port forming portion (21) that forms a fuel port (104), a portion of a peripheral wall (104s, 104t) located on a perpendicular lower side when a fuel supply device (FS) is in a mounting posture of being mounted to a vehicle (FR) formed as a convex drain groove (110) from a corner portion (104c) at which an insertion-side open/close member (11) for opening/closing the fuel port makes contact with an open base portion (104sf) of the fuel port to an open end side of the fuel port. The drain groove (110) is inclined in a horizontal direction such that the open end side of the fuel port (104) is located closer to the perpendicular lower side than a corner portion side when the fuel supply device (FS) is in the mounting posture, to thereby improve draining function of the drain groove (110) provided to the fuel port (104).

A flap valve apparatus includes a main body; a valve body; and a spring member. The main body includes support shafts, and the valve body includes bearing portions. When viewed from the axial direction of the support shaft, the bearing portions has a bearing hole with an inner diameter larger than the outer diameter of the support shaft; and an introduction groove being in communication with the bearing hole from the seal surface side of the valve body. A width of the introduction groove is smaller than the outer diameter of the support shaft, but is expandable to receive the support shaft. When viewed from the axial direction of the support shaft, an opening portion of the introduction grove is positioned near the axial center of the main body.

Disclosed herein is an integrated fuel mixing prevention device for a diesel vehicle, in which a diesel filler neck and a urea filler neck are integrated with each other to prevent fuel from mixing, allowing only a diesel fuel filling gun to be inserted into a fuel inlet when a diesel fuel filling mode is selected and allowing only a urea filling gun to be inserted into the fuel inlet when a urea filling mode is selected, which may prevent a fuel mixing an accident caused by incorrect replenishment.

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.

A fuel tank check valve, which can prevent one portion of a coil portion of a torsion coil spring from being stuck on a stepped portion of a pivot includes a cylindrical member defining a flow channel for a fuel fluid; a flap axially supported on the cylindrical member through a pivot; and a torsion coil spring urging the flap in a closing direction. The pivot includes a large diameter portion around which a coil portion of the torsion coil spring is wound; and a first small diameter portion and a second small diameter portion coaxial with each other, and projecting into a shaft hole provided in either one of the cylindrical member or the flap. The first small diameter portion adjacent to the large diameter portion is off-centered to a side where the torsion coil spring presses against the pivot relative to the large diameter portion.

An operating medium tank arrangement for a motor vehicle includes an operating medium tank; a filling tube for refueling the operating medium tank, wherein the filling tube is fluidly connected on one side to the operating medium tank and on the other side has an insertion opening for receiving a refueling device; a guide insert arranged in the filling tube for guiding the refueling device; and a liquid separator including a separator chamber which is divided into a first sub-chamber and a second sub-chamber, wherein the first sub-chamber is fluidly connected to the operating medium tank via a ventilation line, wherein the second sub-chamber is fluidly connected to a filter device, wherein the separator chamber is fluidly connected to the filling tube for purging operating medium separated in the liquid separator into the filling tube, and wherein the first sub-chamber and the second sub-chamber are fluidly connected with each other via a labyrinth separator which is formed by the liquid separator and the filling tube.

A closure of a tank of a motor vehicle for closing a filler neck gas- and fluid-tight, having a closure fastened to a flap, the flap being fastened to a vehicle body of the motor vehicle such that it is movable into an open or closed position, the closure including a seal, which causes the closure to close against the filler neck. The tank closure should be easy for a user to handle and have a relatively simple design and be economical to manufacture. This is achieved in that the seal is electromechanically or pneumatically adjustable with the aid of an actuator.

A filler neck closure assembly includes a nozzle-receiving housing associated with a vehicle fuel tank filler neck. The nozzle-receiving housing is formed to include a central housing passageway sized to receive the tip of a fuel-dispensing pump nozzle therein during refueling of the fuel tank.