Methods and systems are provided for indication of a degradation in an EVAP and/or fuel system. In one example, a method for indication of a presence or absence of a degradation in a refueling system may include vacuum pull-down and pressure bleed-up tests being carried out based on a state of submersion of a spud valve in liquid fuel in a fuel tank.

A structure for opening and closing a fuel filler opening having a main flap and a dust flap that are opened or closed in accordance with insertion or removal of a fuel gun to a filler pipe. The dust flap is arranged at an outer end side with respect to the main flap, and is constituted by a plurality of flaps arranged flush with each other. The dust flap is opened such that ends of the respective flaps are separated from each other by the fuel gun inserted into the filler pipe.

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.

Embodiments of the present disclosure provide a method of forming a cover of a fuel intake system of a vehicle. The method may include providing a mold that defines a cover-forming cavity having a main body portion and a grounding strap portion connected to the main body portion, inputting a forming material into the cover-forming cavity to a specified level, allowing the forming material within the cover-forming cavity to cool and harden, separating the mold to expose the cover having an integrally molded and formed grounding strap, and removing the formed cover having the integrally molded and formed grounding strap from the separated mold.

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.

A fuel-mixing prevention filler neck device is provided. The fuel-mixing prevention filler neck device includes a fuel dispensing gun insertion unit that receives a fuel dispensing thereinto and a coupling unit that provides fluid communication with a bottom of the fuel dispensing gun insertion unit. The coupling unit is disposed on an exterior circumferential surface thereof with coupling protrusions for fastening with a plurality of slots formed in a filler pipe. Further, a first side of a lower portion of the coupling unit is open to form a coupling region. A misfueling prevention unit slidably moves to the coupling region to be coupled to the coupling unit. Additionally, the misfueling prevention unit is closed when a gasoline fuel dispensing gun is inserted and being opened when a diesel fuel dispensing gun is inserted.

A device for protection against incorrect refuelling, the device including a housing having housing tabs, a separating element to be opened to permit refuelling, and a closing element arranged in, and axially moveable axially relative to the housing. The closing element has at a periphery thereof closing tabs assigned to the housing tabs to form a catch connection which is reversibly released by insertion of a suitable filler nozzle to open the separating element.

A filling device for an operating fluid tank, comprising a tubular outer part and an inner part which is received in the outer part and which is designed to receive an operating fluid nozzle, is characterized in that the inner part comprises a first end wall having an opening and a second end wall having an opening, the end walls being connected to one another via a shell and the shell being provided over the entire length between the end walls with a shell opening whose width corresponds substantially to the corresponding maximum inner width of the shell.

A fuel nozzle receiving assembly may include a base having a nozzle channel formed therethrough, an outer wall connected to the base, wherein an internal chamber is defined between the base and the outer wall, and a seal member secured to the base and extending around at least a portion of the nozzle channel. The seal member is configured to sealingly engage a fuel nozzle that passes into and through the nozzle channel.

A fuel filler structure includes a base member, a shutter member, a seal part, and an opening part. The base member includes a fuel filler port and a fuel filler port outer circumferential part which is provided outward further than the fuel filler port. In the shutter member, an opening-closing valve is supported movable to a closed position and an open position. The seal part is arranged between the fuel filler port outer circumferential part and the opening-closing valve when the opening-closing valve is located at the closed position. The opening part connects together an outer surface and an inner surface of the fuel filler port outer circumferential part, and a second opening end of the opening part is arranged at a position that overlaps the opening-closing valve when the opening-closing valve is located at the closed position.