Abstract: A fuel-outflow check valve includes: a casing, at least one portion of which is located in a fuel tank, the casing having a ventilation hole via which the interior of the casing and the interior of the fuel tank communicate with each other and an upper wall portion protruding inward from the inner peripheral face of the casing; a float that is disposed in the interior of the casing and is vertically movable; and a valve element that is provided on the float and can contact a valve seat formed at the casing.

Abstract: An assembly mountable to a fuel tank and connectable to a carbon canister includes a housing defining an internal cavity. A vapor vent valve is configured to permit fluid communication from the fuel tank through the vapor vent valve from an inlet to an outlet, and in all cases is isolated from the internal cavity so that fluid flows through the vapor vent valve from the inlet to the outlet without fluid communication with the internal cavity. A first vent line connects the outlet of the vapor vent valve with a first port of the housing. A second vent line connects a second port of the housing with the carbon canister. At least a portion of the first vent line is above a predetermined liquid fuel level within the tank when the assembly is mounted to the fuel tank and tilted at up to a predetermined angle.

Abstract: A valve including a mechanical part, e.g. a float, for performing a ROV function (Roll Over Valve) and an electronic part, e.g. an electronically controlled solenoid valve, for performing a venting function.

Abstract: The fuel tank unit includes a fuel cutoff valve fastened to a support body. The support body and the casing of the fuel cutoff valve are made of first and second resin materials having different rates of fuel swelling. The fuel cutoff valve is fastened to the support body via a fastening mechanism. The fastening mechanism entails engaging a first support engaging portion and a second support engaging portion of the support body in first and second fastening engaging portions composed of hooks formed on the casing of the fuel cutoff valve, at first and second hook engagement levels that represent the bite of the hooks. The engaging portions are designed such that prior to fuel swelling of the support body and the base cover first hook engagement exceeds second hook engagement, whereas subsequent to fuel swelling second hook engagement exceeds first hook engagement.

Abstract: A valve assembly (10) able to be mounted with a liquid container, the valve assembly comprising: a housing (20) having a passageway (60) that extends through the housing; a breather float valve (80) mounted within the housing, the breather float valve movable between an open position to allow gas to pass through the passageway and a closed position that prevents liquid from passing through the passageway; a liquid inlet (30), forming part of the housing, the liquid inlet allowing fluid to pass into the housing; and an inlet float valve (41) mounted within the housing, the inlet float valve movable between an open position that permits the flow of liquid through the liquid inlet and a closed position that prevents the flow of fluid through the liquid inlet.

Abstract: A fuel vapor vent valve assembly includes an anti-trickle valve having a casing defining a first cavity. A movable element is disposed within the first cavity. The casing defines a lower dynamic vapor passage in fluid communication with an interior of a fuel tank. A concave ramp is disposed concentrically about the lower dynamic vapor passage, within the first cavity. The movable element moves upward along the concave ramp in response to a change in motion to open fluid communication through the lower dynamic vapor passage to vent vapor pressure from within the fuel tank during movement.

Abstract: A valve body and a float body are coupled so that the valve body is allowed to move in a direction along a central axis of movement of the float body, and the seated valve body is unseated when the float body descends. On a central axis side of the movement of the float body, a pair of guide members is provided, and when the valve body tilts, the valve body and the float body contact each other on a lower side of a tilt of the valve body and the float body ascends, so that the guide members correct the tilt. Also, when the float body ascends, the float body and the valve body do not contact each other in a rest of a portion.

Abstract: A valve body and a float body are combined by respectively coupling two or more coupling parts provided on one of the valve body and the float body to coupled parts provided on the other of the valve body and the flat body in a state allowing upward and downward movements of the valve body. During descent of the float body, one coupling part of the two or more coupling parts is caught on the coupled parts ahead of the other coupling parts whereby the valve body is tilted, and the other coupling parts restrict the tilting of the valve body.

Abstract: Provided is a fuel cut-off valve capable of preventing liquid fuel from flowing into a valve inside from an evaporation line side, and inhibiting the liquid fuel from flowing into a canister side. The fuel cut-off valve includes: a housing main body including a lower space and an upper space partitioned through a partition wall; a float valve coming into contact with/moving away from a first opening; a lid sealing the upper space; an evaporation line connection pipe communicated to the upper space; a canister connection pipe similarly communicated to the upper space; and a second opening formed in a portion coupled to the evaporation line connection pipe and a third opening formed in a portion coupled to the canister connection pipe, which are surrounded by walls formed in the housing main body and/or the lid, and communicated to each other only through the upper space beyond the walls.

Abstract: A valve device is used by being attached to a fuel tank. The valve device includes a main body portion provided with ventilation openings which become an inner end of a connecting passage with the outside of the fuel tank, a valve body opening and closing the ventilation openings using a liquid surface of a fuel, and a skirt portion extending down from the main body portion so as to surround the valve body, and also constructed so as to admit fuel due to a pressure difference between inside and outside of the fuel tank when the liquid surface of the fuel reaches a cuff portion of the skirt portion.

Abstract: In a vent control valve for a fuel tank, a housing receiving a float assembly therein is provided with a communication hole passed across a wall of the housing, and an opening of the communication hole facing an interior of the housing is directly exposed to an interior of the housing when the float assembly is in a low position and overlaps with a peripheral wall of the float assembly when the float assembly is in a high position. By suitably selecting the size of the communication hole and/or the number thereof, a desired delay in the dropping of the liquid fuel level in the housing following the filling up of the fuel tank can be achieved. Thereby, overfilling of the fuel tank can be avoided.

Abstract: A tank venting system is configured to regulate air and fuel vapor flow between a fuel tank and a fuel vapor recovery canister. A roll-over valve is included in the tank venting system.

Abstract: Safety valve for the venting circuit of a liquid tank Safety valve for the venting circuit of a liquid tank, comprising: a) a chamber (1) provided with a cover (2), which extends at least partly into the tank and is connected via an aperture (4) to the venting circuit; b) a float (7), which can slide vertically inside the chamber (1) and close off the venting aperture (4) in a high position; and c) a moveable wall (3), which divides the chamber (1) into a lower portion (1?) in which the float (7) slides and an upper portion (1?) which connects with the venting circuit, this wall (3) being a moveable wall and having the venting aperture (4), said valve further including an aperture stop (13) integral either with the moveable wall (3) or with the cover (2).

Abstract: The tank valve unit includes a support body, and a fuel cutoff valve installed on the support body. The support body includes a mounting plate having a support engaged portion. The fuel cutoff valve has a casing in which a valve chamber is defined by a tubular casing body and a bottom cover installed in the bottom part of the casing body; and a float mechanism housed inside the valve chamber. The bottom cover has a first engaging portion adapted to attach to the casing body by engaging the casing body, and a second engaging portion adapted to secure to the mounting plate by engaging the support engaged portion.

Abstract: A valve assembly is provided that permits adjustable vent flow from the fuel tank vapor space through a bypass vent opening based on a condition in the vapor space after nozzle shutoff. The valve assembly including a first valve, also referred to as a main float, that provides rollover protection and controls venting of the vapor space prior to nozzle shutoff. A secondary closure device, also referred to as a second valve, moves independently of the first valve to control venting of the vapor space after nozzle shutoff through a bypass vent opening formed in the valve housing in response to at least one operating condition in the fuel tank outside of a chamber defined by the valve housing in which a main float moves.

Abstract: A roll-over valve attaches over an existing carburetor float bowl vent tube and closes when a car is involved in a crash to prevent or reduce fuel from escaping from a tilted or inverted carburetor and starting a fire. Carburetors are used in many special interest cars and race cars. The carburetors include float bowls containing fuel and the float bowls are vented to outside air by the carburetor vent tubes. The carburetor vent tubes are generally vertical tubes reaching upward from the carburetor into an air cleaner or the volume above the carburetor. The roll-over valve includes a compression fitting or other connector and is easily fitted to the carburetor.

Abstract: A fuel shutoff valve includes a valve chamber, a casing, a float, and a shock absorber. The casing includes a body, a cylinder, and a seal. The float is accommodated in the valve chamber. The shock absorber includes a seat attaching to and detaching from the seal of the casing. The shock absorber includes a first arm, a second arm, a contact, and a locker. The first arm protrudes outward from the seat of the shock absorber diametrically, and exhibits elasticity. The second arm exhibits elasticity. The contact is disposed at the leading end of the second arm, and comes in contact with the float. The locker is disposed at a diametrically-outer-side leading end of the first arm, and locks to the body of the casing when the shock absorber is positioned at the lowermost level in the valve chamber.

Abstract: A fuel vapor vent valve assembly is provided that may include a float valve and an isolation valve arranged in series with each other. Bypass openings in the valve assembly create multiple flow paths as the float valve and the isolation valve respond to changes in fuel tank pressure and fuel level. The control valve assembly may include a housing defining a chamber with a main opening configured to open the chamber to the tank, a vapor vent passage and a first bypass vent opening. A float in the chamber closes the vapor vent passage when fuel in the chamber is at or above a predetermined level. The first bypass vent opening vents the tank to the chamber even when the fuel covers the main opening. A feature on the float provides a metered opening of the vapor vent passage between closed and fully open based on float position.

Abstract: Valve for the venting circuit of a liquid tank, the valve comprising a chamber which includes openings that allow liquid to penetrate into the chamber above a certain level in the tank and/or in the event of waves in the tank or the tank being turned upside down, a cover for the chamber including an aperture that is susceptible to open into the venting circuit of the tank, and a float comprising a body and a needle that close off the aperture, the float being able to slide vertically inside the chamber depending on the level of liquid therein, the needle of the float being frustoconical-shaped and based on an elastomeric material.

Abstract: Provided is a float valve device which allows a valve to be quickly opened when, in a state in which a float has been raised as a result of a rise in fuel liquid level to close the valve, the fuel liquid level is lowered again. The float valve device includes a housing, a float accommodated in the housing, a movable valve adapted to abut a valve seat to close an opening, and a retention frame to retain the movable valve so as to allow the movable valve to ascend/descend by a predetermined distance and to incline with respect to the float. Further, a circumferentially uneven protrusion is formed on a portion where the retention frame and the movable valve abut each other. When the float is lowered in a valve-closed state, the protrusion first abuts the movable valve to impart a lowering force thereto.

Abstract: Valve for the ventilation circuit of a liquid tank, comprising: a) a chamber comprising a base, a side wall and a cover; b) at least two independent ventilation orifices in the chamber cover connecting the chamber to the venting circuit; c) at least one orifice in the chamber side wall connecting the chamber to the inside of the tank; d) at least two independent concentric floats, each comprising an apex capable of sealing one of the ventilation orifices, each being able to slide vertically inside the chamber depending on the liquid level in the chamber and to rest on the chamber base when the chamber is empty; one of the floats being calibrated so as to seal one of the ventilation orifices at one liquid level L1 in the tank and the other float being calibrated so as to seal the other ventilation orifice at a level L2 above L1.

Abstract: A roll-over vent valve comprising a housing formed with a fluid inlet and a fluid outlet, a valve seating bounding an outlet aperture of the housing, a float member received within the housing and axially displaceable between a sealed position wherein a sealing member thereof sealingly bears against the valve seating of the outlet aperture to seal the fluid outlet, and an open position wherein the sealing member is disengaged from the valve seating whereby the fluid outlet is in flow communication with the fluid inlet. There is further provided a pressure-retention device extending intermediate the valve seating and the fluid outlet, to thereby shut fluid flow therebetween as long as pressure differential between the fluid inlet and the fluid outlet does not exceed a minimal pressure threshold.

Abstract: A fill limiter vent valve (FLVV) adapted for suspension downward into a fuel tank has upper and lower housing members having openings in their cylindrical walls cooperating to define a spill-over level for fuel into the FLVV producing float-initiated vent valve closure during a fuel fill event. The lower housing member has a latching member fixedly engageable with one or more cooperating latching features of the upper housing member in a plurality of relative axial positions; and the spill-over level is varied by relative axial movement of the housing members between those positions. Axial alignment of the latching member and the cooperating latching features is maintained by axially aligned, interacting surface features of the housing members.

Abstract: A fuel cutoff valve is furnished with a casing defining a valve chamber, and a float mechanism housed to be able to rise and fall in the valve chamber. The casing is furnished with a closure plate situated in the space above the valve chamber and in a facing arrangement with a connecting passage. The closure plate is furnished with a vent hole that has been formed so as to divert the passage from the connecting passage to a second pipe line, and with a barrier wall that is situated in opposition to a first pipe line and that has been formed so as to divert the passage from the first pipe line to the second pipe line.

Abstract: A valve assembly (10) able to be mounted with a liquid container, the valve assembly comprising: a housing (20) having a passageway (60) that extends through the housing; a breather float valve (80) mounted within the housing, the breather float valve movable between an open position to allow gas to pass through the passageway and a closed position that prevents liquid from passing through the passageway; a liquid inlet (30), forming part of the housing, the liquid inlet allowing fluid to pass into the housing; and an inlet float valve (41) mounted within the housing, the inlet float valve movable between an open position that permits the flow of liquid through the liquid inlet and a closed position that prevents the flow of fluid through the liquid inlet.

Abstract: Ventilation system for a fuel tank comprising a pump, an active liquid/vapor separator (LVS) that can be drained using the pump, in which a roll-over valve (ROV) that is normally open brings, by default, the internal volume of the LVS into communication with the pump and only blocks this communication when the level of fuel in the valve reaches a certain height or when the tank is tilted beyond a certain angle, or even overturned.

Abstract: According to various aspects, exemplary embodiments are provided of valve apparatus and combination filter valve assemblies. One exemplary embodiment provides a combination filter valve apparatus suitable for filtering objectionable particulate matter from a fluid and for selectively occluding a fluid flow opening. In this exemplary embodiment, the apparatus generally includes an outer member, a sealing member, and filtration media disposed generally between the outer member and the sealing member. The filtration media may be configured to generally support the sealing member for resilient movement relative to a fluid flow opening between open and closed positions. In the open position, the sealing member may be spaced apart from the fluid flow opening. In the closed position, the sealing member may be in sealing engagement with and substantially blocking the fluid flow opening, thereby inhibiting the ingress of fluid into or egress of fluid out of the fluid flow opening.

Abstract: A breather device A1 for pressure relief includes a breather pipe 121 serving as a fixing part, and an inner pipe 122 serving as a communication part and is provided by the breather pipe 121 with fixation strength enough for securing the breather device A1 to a liquid tank 101. The inner pipe 122 has a vent hole P formed therein for provide fluid-communication between the inside of the liquid tank 101 and the outside thereof in a manner such that an inner surface forming the vent hole P is made of a resin.

Abstract: A combustion device in the form of a paraffin stove (10) comprises a fuel reservoir (12), a burner (14), stand pipe (16) which extends between the reservoir (12) and the burner (14) and a stove top (18). The reservoir (12) comprises a rigid, air-tight outer container (22) and a deformable bladder (25) for holding paraffin (27) which is located within the container (22). The bladder has an outlet (44) which is connected to the stand pipe (16). A conduit (51) which can be connected to a source of compressed air is connected to the container (22) for pressurizing the container (22) to exert a force on the bladder (25) sufficient to cause the paraffin to be delivered to the burner (14) where it is ignited to produce a flame.

Abstract: A fuel cutoff valve comprises a casing having a seal portion disposed facing a connecting passage and projecting in annular configuration towards a valve chamber; and a float mechanism having a float which rises and falls due to increasing and decreasing buoyancy according to the fuel level within the valve chamber. The float comprises a flexural depression-enabling recess situated on its upper surface at a location in opposition to the seal portion, for enabling the seat portion to undergo flexural depression when pressed by the seal portion. The casing has a regulating portion on the outside perimeter of the seal portion, for regulating the level of elastic deformation at which the seat portion elastically deforms into the flexural depression-enabling recess.

Abstract: A valve for the venting circuit of a liquid tank including a main chamber which opens into the tank and is connected via an aperture to the venting circuit, a float comprising a body, and a head capable of closing off the orifice. The float being able to slide vertically inside the main chamber. The valve further including a baffle surrounding the aperture and defining a secondary chamber via the bottom inside the main chamber. The dimensions and the shape of the secondary chamber, of the body of the float, and of the head of the float are designed so that the head can slide at least partly inside the secondary chamber, while the body of the float cannot do so.

Abstract: An on-board refueling vapor recovery system includes a shutoff mechanism that closes a first vapor path between the fuel tank and the filler cup when liquid fuel in the tank reaches a predetermined level and a vent line closure that closes a second vapor path between the canister and the filler cup, wherein closure of the first vapor path and the second vapor path reduces pressure in the filler cup to induce shutoff of a fuel nozzle.

Abstract: A fuel cutoff valve comprises a casing and a float mechanism having a float and a seat portion. An upper vent hole is formed in the upper wall portion of the float, and a side portion communication hole is formed in the side wall portion. The passage area of the side portion communication hole is set so as to allow a large volume of vapors entering the float chamber to escape into the valve chamber. The passage area of the upper vent hole is set so that vapor entering the float chamber when the vehicle inclines escapes into the valve chamber, and the float chamber fills with fuel lifting the float, whereas when the vehicle turns sharply, the float is lifted without the float chamber filling with fuel.

Abstract: A double shut-off refueling valve responds to a full fuel tank level by closing the recirculation line and the canister line. The valve includes at least one float having one or more sealing surfaces corresponding with the recirculation line and the canister line, respectively. The sealing surface is on the top of a float in the float valve. When the fuel in the tank reaches a full level, the float moves upward to close the recirculation line and the canister line substantially simultaneously. In one embodiment, the valve is a float valve having a coaxial seal where the two valve openings corresponding to the recirculation line and the canister line are arranged concentrically. In other embodiments, the sealing surfaces can be, for example, a ribbon seal, two separate sealing surfaces, or any other seal configuration that corresponds with the orientation of the recirculation line and the canister line within the fuel system.

Abstract: A fuel cut-off valve includes a case having a first opening communicated with the inside of a fuel tank and a second opening communicated with a canister; a lower float that is provided so as to move up and down inside the case and has a first valve member above the lower float; an upper float that is provided so as to move up and down above an upper portion of the lower float and has a second valve member and a third opening communicated with the canister; a first valve seat provided on the upper float, against which the first valve member abuts to close off the third opening; a second valve seat against which the second valve member abuts to close off the second opening; and a guide member that guides the upper float when the upper float moves up and down.

Abstract: A vent apparatus is adapted to be mounted in an aperture formed in a fuel tank. The vent apparatus includes a vent controller sized to extend through the fuel tank aperture and an outer cover coupled to the vent controller and welded to the fuel tank to support the vent controller in the fuel tank aperture.

Abstract: A refueling shut-off system is provided for use with a vehicle fuel system including a fuel tank, a fuel tank filler neck, and a fuel vapor recovery canister. The system includes a fill-limit vent valve and a flow-control valve.

Abstract: An object is to provide a filler cap of a fuel tank capable of securely preventing a disadvantage that, when the fuel tank tilts, fuel stored in the fuel tank is discharged from an air passage disposed at a cap main body. The cap includes the air passage which is constituted at the cap main body and which allows the inside of the fuel tank to communicate with the outside, and a valve mechanism portion constituted at this air passage. The valve mechanism portion includes a tube main body having a tube-like portion and a reduced diameter portion formed externally and continuously from this tube-like portion, a float stored in the tube main body with a space between the float and an inner surface of this tube main body, a piston positioned on a fuel tank side of the float and stored in the tube main body with a space between the piston and the inner surface of the tube main body, and a spherical member positioned on an outer side of the float and stored in the tube main body.

Abstract: One embodiment of a thermal relief vent includes a float including a side surface and a top surface, and a seal secured to the surface of the float and extending over the top surface of the float.

Abstract: A variable flow valve includes a housing, a valve element, an urging member, a first valve, a second valve, and a guide flow passage. The housing has an inlet opening, and an outlet opening. The first valve and second valve are formed between the valve element and the housing. The valve element has a separator wall. The separator wall separates the inlet opening and the outlet opening, and makes the second valve together with the housing. The guide flow passage is disposed on an inlet-opening side of the separator wall, and connects the inlet opening with the outlet opening when the separator wall moves to open the communication between the inlet opening and the outlet opening. The variable flow valve can make fluids flow without generating any turbulent flow, and can cope with the increment/decrement of required breather-gas flow volume more accurately.

Abstract: A valve assembly (10) able to be mounted with a liquid container, the valve assembly comprising: a housing (20) having a passageway (60) that extends through the housing; a breather float valve (80) mounted within the housing, the breather float valve movable between an open position to allow gas to pass through the passageway and a closed position that prevents liquid from passing through the passageway; a liquid inlet (30), forming part of the housing, the liquid inlet allowing fluid to pass into the housing; and an inlet float valve (41) mounted within the housing, the inlet float valve movable between an open position that permits the flow of liquid through the liquid inlet and a closed position that prevents the flow of fluid through the liquid inlet.

Abstract: Valve for the ventilation circuit of a liquid tank, comprising: a) a chamber comprising a base, a side wall and a cover; b) at least two independent ventilation orifices in the chamber cover connecting the chamber to the venting circuit; c) at least one orifice in the chamber side wall connecting the chamber to the inside of the tank; d) at least two independent concentric floats, each comprising an apex capable of sealing one of the ventilation orifices, each being able to slide vertically inside the chamber depending on the liquid level in the chamber and to rest on the chamber base when the chamber is empty; one of the floats being calibrated so as to seal one of the ventilation orifices at one liquid level L1 in the tank and the other float being calibrated so as to seal the other ventilation orifice at a level L2 above L1.

Abstract: Disclosed is a fuel leakage preventing valve, involving no variations in valve closing characteristics, in which a vertically movable float valve is arranged in a chamber defined inside a housing and in which a valve seat of the housing communicating with an outside is opened and closed by the float valve, which has a protruding step portion formed upwardly at the center of an upper surface of the float valve, a retainer fixed to the upper surface side of the float valve, the retainer having a flange portion covering the upper surface of the float valve and a cage portion raised from the flange portion to define an accommodating space in conjunction with the protruding step portion of the float valve; and a valve body for opening and closing the valve seat of the housing is rockably accommodated in the accommodating space defined by the cage portion.

Abstract: A liquid exhaust valve gear includes a housing divided into an upper chamber and a lower chamber by being partitioned by a partition plate having an opening portion, and a float slidably contained at inside of the lower chamber and moved up by receiving liquid inside of the hermetically sealed vessel. An upper end portion of the float is provided with valve means for closing the opening portion of the partition plate in accordance with moving up the float, further, a partition wall in a cylindrical shape is provided to extend in an upper direction from a peripheral edge of the opening portion at inside of the upper chamber, the partition wall is opposed to an opening of an exhaust port, and a notched portion which is not opposed to the opening of the exhaust port.

Abstract: A bleed valve which is intended for the fuel tank of a vehicle has a housing, a floating body disposed in such a manner as to be able to move in the longitudinal direction. A rim of an outlet orifice forms a valve seat for a sealing element which is supported by a support disc, wherein the support disc is articulated in a cardanic manner on the floating body. The sealing element is disposed in such a manner as to be able to move according to the movement of the floating body between a position which closes the outlet orifice and a position which opens same, wherein as a result of the said articulation of the support disc on the floating body positional changes, e.g. inclined positions, which are caused by the drive operation of the vehicle do not impair the sealing function.

Abstract: A float valve structure that includes a case; a valve seat that is formed at an end portion of the case, at a position near an upper opening of the case; a float that is arranged in a space formed in the case so as to be vertically movable; a valve support member that is arranged above the float and that can be inserted into the upper opening; a valve that is fitted to the valve support member and that can contact the valve seat; and a valve opening member that can vertically move together with the float and that opens at least one portion of the valve.

Abstract: A cut valve which is installed on a fuel tank and is adapted to shut off a vent passage between the interior of the fuel tank and the outside when a fuel level in the fuel tank has risen, including: a housing having: a cover having a lead-out pipe connected to an external pipe; a tubular body having a vent hole communicating with the lead-out pipe; and a bottom portion closing a lower surface of the tubular body; and a float valve which is adapted to open or close the vent hole by coming into contact with and moving away from a valve seat provided at a peripheral edge of the vent hole in the ceiling portion, wherein an inner periphery of the valve seat has a tapered shape in which its diameter is gradually enlarged in a direction toward the float valve.

Abstract: The device includes an air release valve for a fuel tank of a motor vehicle, the air release valve comprising a housing defining at least one inlet opening therein, a central axis and a wall disposed proximate the inlet opening, the wall defining at least two outlet openings therein, the two outlet openings being sized differently; a sealing seat disposed about the two outlet openings; a float disposed in the housing moveable along the central axis, the float defining a center aligned with the central axis; and a flexible membrane attached proximate the center and extending freely therefrom to seal the two outlet openings.

Abstract: The fuel tank ventilating device includes a fuel cutoff device, and a connector pipe connecting the fuel cutoff device with a canister. The fuel cutoff device includes a first fuel cutoff valve, a second fuel cutoff valve, and a positive pressure valve; the first flow pipe and the second flow pipe are connected to a third flow pipe by a connecting part, and are connected to the canister. With the first fuel cutoff valve in a first submersion state, fuel that has collected in the first flow pipe will be returned to the fuel tank on the basis of a differential pressure between tank internal pressure and the pipe internal pressure bearing on the fuel inside the first flow pipe. With the first fuel cutoff valve in a submersion state, fuel that has leaked into the second flow pipe will not reach the connecting part.

Abstract: A fuel cutoff valve is provided with a casing that forms a valve chamber that is connected to a connection conduit, a float mechanism that is housed so as to be able to rise and fall in the valve chamber, and a spring that supports the float mechanism. The float mechanism is structured through an assembly of a first float body and a second float body, where the first float body is provided with a valve portion that opens and closes the connection conduit and provided with a storage chamber that is open on the bottom, where the second float body is housed in the storage chamber to be assembled into the first float body.