Abstract: A vent module is adapted to be mounted in a top wall of a fuel tank to vent fuel vapor from the tank to a vapor recovery canister located outside the tank. An outer shell is positioned around the vent module to define a fuel vapor transfer passageway arranged to conduct liquid fuel droplets into a liquid fuel accumulation chamber. A fuel vapor transfer port is formed in the outer shell to admit fuel vapor into the fuel vapor transfer passageway. A fuel vapor inlet port is formed in the vent module to lie below the fuel vapor transfer port. Liquid fuel entrained in fuel vapor is shed as fuel vapor flows laterally from the fuel vapor transfer passageway into the vent module through the fuel vapor inlet port so that “demoisturized” fuel vapor flows into the vent module and liquid fuel droplets fall into the liquid fuel accumulation chamber.

Abstract: A vent apparatus includes a valve assembly and a tank mount adapted to support the valve assembly in a mounting aperture formed in a fuel tank. The valve assembly includes a movable vent valve and a valve housing containing the movable vent valve. A labyrinthine boundary is established between the valve housing and the tank mount to provide a low-permeation joint therebetween. The valve housing is made of a non-weldable plastics material and the tank mount is made of a weldable plastics material.

Abstract: A self-priming centrifugal pump including a supplementary vacuum pump and a float valve. The vacuum pump serves to draw liquid to the pump for priming and the float valve shut of flow to the vacuum pump when liquid reaches a predetermined level to prevent entry of liquid into the vacuum pump. In some embodiments the float valve includes an o-ring valve seal and the vacuum pump includes an oil delivery system to distribute oil from an oil reservoir to improve lubrication.

Abstract: A device includes a housing fixed to an upper wall of a fuel tank, and having a communication opening in communication with a canister, a float valve received within the housing and floating on a fuel, and the float valve moving upward and downward so as to close and open the communication opening, and a tubular member communicating with the housing, and extending downwardly from the housing into the interior of the fuel tank. The device has through holes of a small diameter which are disposed near an upper wall of the fuel tank, and when the liquid level of the fuel in the fuel tank reaches the lower end opening of the tubular member, a pressure within the fuel tank increases, whereby the filling-up of the fuel tank is detected. When the liquid level of the fuel abnormally rises, the float valve closes the communication opening.

Abstract: The present invention involves a venting system for venting a gaseous fluid from a tank having an aperture and a fuel delivery module cover. The tank is made of a predetermined material. The venting system comprises a venting valve disposed within the aperture. The venting valve includes a valve body having a top portion and a neck portion extending from the top portion. The top portion is disposed outside the tank and is engaged thereto. The neck portion is disposed in the tank and has an index and a port extending from the neck portion. The port is formed below the index relative to the top portion. The port is in fluid communication with the valve when the valve vents the gaseous fluid. The venting system further includes a channel having first and second ends, wherein the first end connects to the port within the tank so that the venting valve is in fluid communication therewith when the valve vents the gaseous fluid.

Abstract: The present invention provides a reliable regulating device that permits liquids, such as fuel oils, to be drained into the enclosure while preventing the flow of gases into the enclosure. The device includes a valve housing having a chamber for receiving the liquids and the gases and a drain valve means in open flow communication with the liquids and gases. The drain valve means includes a valve seat and a float member both located within the valve housing. The float member has a specific gravity less than the liquids passing through the device. The float member floats off the valve seat when the liquids flow through the valve housing and engages the valve seat when gases are present in the chamber preventing the gases from entering the enclosure.

Abstract: A fuel cutoff apparatus is provided with an outer casing and an inner float disposed inside the outer casing so as to be vertically movable therein. A plurality of openings are provided in a side face of the outer casing. A valve opening is provided at a top portion of the outer casing and a valve body is provided at a top portion of the inner float. There is also provided a plate that closes a bottom surface of the outer casing and an exhaust port for exhausting fuel provided in the plate closed by a valve protrusion provided on a bottom portion of the inner float.

Abstract: An over filling and roll over valve includes a housing, in which a valve assembly is located. The valve assembly includes a first stage member and a second stage member, being coaxially and relatively displaceable within the housing. The first stage member has a slit-like aperture at a bottom and an outlet aperture at the top. The inlet and the outlet apertures are in flow communication. The second stage member is a float provided with a flexible membrane strip for closing the slit-like aperture of the first stage member. The valve assembly is provided with at least one anchoring member extending between the first stage member and the second stage member and permitting a limited freedom of relative movement therebetween in such a manner that displacement of the second stage member into its second position entails positive displacement of the first stage member into its second position.

Abstract: A vent valve for use with a fuel containing system including a fuel tank and a vapor recovery system. The vent valve includes a housing which communicates with the fuel tank and the vapor recovery system. The housing defines a path between the fuel tank and vapor recovery system. A float valve is positioned in the housing and is responsive to the presence of fuel in the tank. The housing has at least one vacuum vent positioned in the path. An umbrella valve is carried on the housing and positioned between the fuel tank and the vapor recovery system. The umbrella valve has a wall defining an orifice extending therethrough and a cover portion extending from the wall. The orifice is selectively sealed at one end by the float valve and is selectively sealed at the opposite end by the head valve.

Abstract: A fuel vapor treating apparatus includes a lower valve casing and an upper valve casing. A float is provided in the lower valve casing and a valve portion is provided in the float for sealing the flow of fuel. A valve port is provided between the lower valve casing and the upper valve casing and is opened and closed by the valve portion. A vent passage portion is provided in the upper valve casing. A space portion is provided between the vent passage portion and the valve port. A valve portion of the float moves vertically in accordance with a liquid level in a fuel tank and opens and closes the valve port, whereby the fuel tank is brought into communication with the vent passage portion. A vent port is provided in a partition that separates the space portion from the vent passage portion. And, a second float is provided to open and close the vent port. The fuel vapor treating apparatus reliably stops fuel leakage from the fuel tank.

Abstract: A ventilation-side floating valve 40 is provided for a fuel tank divided into a main tank part and a sub-tank part through a swelling part. The valve 40 includes an upper casing part 41 in which a float 46, a spring 47 and a retainer 48 are accommodated and a lower casing part 42. In arrangement of the valve 40, the upper casing part 41 is arranged on a central-upper part of the fuel tank above the swelling part. The lower casing part 42 is bent avoid the swelling part.

Abstract: A liquid fuel trap device for a vehicle fuel tank, including a housing formed with a confined space with at least one inlet port. The at least one inlet port is connectable to a corresponding fuel valve. There is an outlet port connectable to a fuel vapor recovery system, and a fuel liquid discharge valve adapted for discharging liquid fuel from the space into the tank. The housing further includes a connecting arrangement for attaching the device on an inner surface of an upper wall of the fuel tank.

Abstract: A liquid fuel trap device for a vehicle fuel tank, comprising a housing formed with a confined space with at least one inlet port connectable to a corresponding fuel valve, an outlet port connectable to a fuel vapor recovery system, and a liquid fuel discharge valve adapted for discharging liquid fuel from the confined space into the tank. The housing further comprises a connecting arrangement for attaching the device on an inner surface of an upper wall of the fuel tank.

Abstract: A stop valve which is fitted with a cylindrical supporting portion is comprised of a ring-shaped rigid axial portion, a ring-shaped platy bendable valve portion extending outward, and a sealing lip portion extending inward. The sealing lip portion has a first sealing lip which extends obliquely upward from the rigid axial portion and has a semi-circular seal effecting face provided at an edge thereof, and a second sealing lip which extends obliquely downward from the rigid axial portion and has a semi-circular seal effecting face provided at an edge thereof. The first and second sealing lips have an extending portion which connects the edge seal effecting face with the rigid axial portion and has substantially a same thickness as a diameter of the semi-circular shape.

Abstract: In a vent valve structure including a cut valve that shuts off the flow of fuel vapor and fuel liquid, a positive pressure adjustment valve that opens when positive pressure is applied, and a negative pressure adjustment valve that opens when negative pressure is applied, the negative pressure adjustment valve is provided in a row arrangement with the cut valve in a position linking a ventilating passage and a fuel tank so as to bypass the valve opening of the cut valve.

Abstract: A fuel cutoff valve comprises a casing, a cover having a cover supporting part for supporting an upper part of the casing, an O-ring disposed on an outer periphery of the casing, and a seal holding member. The seal holding part is constituted by a member made of a material having a high degree of shape stability, such as a polyamide, into which glass fibers are added. Further, the seal holding part is thermally welded to a welding end of a cover inner layer made of a modified polyamide.

Abstract: Method and apparatus for operating a closed hot water installation provided with a pipe system, a boiler, heat exchangers, an expansion tank, a water make-up provision and a de-aerator, the method including the steps of opening a non-return valve to allow air to escape, detecting a water level in the de-aerator, feeding water to the closed installation when the level falls below a predetermined level, blocking opening of the non-return valve until the water level has fallen to a first level and starting the feed of water when a second lower level is reached.

Abstract: A liquid/vapor separator assembly for a fuel tank of a vehicle includes a liquid separator plate adapted to be disposed within and secured to a portion of the fuel tank to form a liquid trap therebetween. The liquid/vapor separator assembly also includes a standpipe extending from the liquid separator plate and communicating with the liquid trap to allow fuel vapors to flow to a vapor canister. The liquid/vapor separator assembly further includes at least one valve mounted to the liquid separator plate to allow fuel from the liquid trap to return to an interior chamber of the fuel tank.

Abstract: A liquid/vapor separator assembly for a fuel tank of a vehicle includes a liquid separator plate adapted to be disposed within and secured to a portion of the fuel tank to form a liquid trap therebetween. The liquid/vapor separator assembly also includes a standpipe extending from the liquid separator plate and communicating with the liquid trap to allow fuel vapors to flow to a vapor canister. The liquid/vapor separator assembly further includes at least one valve mounted to the liquid separator plate to allow fuel from the liquid trap to return to an interior chamber of the fuel tank.

Abstract: A pipeline vent valve comprising a body (13) defining a chamber (A) having an inlet (17) towards its lower end which is adapted to be connected to a pipeline and an outlet (21) towards its upper end, the outlet defined by a valve seat, a first valve member (23) supported in the chamber to be moveable between a first position at which it is in sealing engagement with the valve seat and a second position at which it is out of engagement with the valve seat, the first valve member in its movement to the first position being responsive to the magnitude of the gaseous flow rate through the valve seat to be moveable to the first position on the gaseous flow rate exceeding a desired level, the first valve member also being responsive to the level of liquid in the chamber and being adapted to close when the liquid level in the chamber exceeds a predetermined level, the first valve member having in opening providing communication to each side of the first valve member, a second valve member fixed to the first valve me

Abstract: A thermostat three-way control valve equipped with an automatic air vent valve for air conditioning fan-coil unit includes a thermostat three-way control valve located between a chilled water supply branch pipe and a chilled water return pipe of a fan-coil unit, and an automatic air vent valve located above the thermostat three-way control valve. The thermostat three-way control valve includes a driving motor which is located at one side of the thermostat three way control valve. The thermostat three-way control valve may be a three-way valve or a two-way valve. The automatic air vent valve can automatically vent air from the fan-coil unit such that no residual air is trapped in the cooling coil of the fan-coil unit thereby to maintain heat exchange efficiency of the fan-coil unit.

Abstract: The float has an elastomeric valve disk with an annular bead rim caged for limited lost motion movement on the top of the float. A rigid backing plate for the valve disk is pivoted on a curved surface on the top of the float to ensure self-alignment of the valve disk on the vent port seat when the float is moved upward by the rising liquid level for closing the vent during refueling. As fuel is used from the tank, the float drops and the angled top of the cage contacts the bead rim on the valve disk and effects a peel-away re-opening of the valve.

Abstract: A motor vehicle fuel tank comprising a shell and inside the shell at least one add-on element such as a valve. Said shell presents a portion in relief and an add-on element is connected to the shell by means of an intermediate element having at least one elastically-deformable portion arranged to be connected after elastic deformation in or on said portion in relief, so as to hold the intermediate element to the shell. The add-on element is arranged to be connected to the intermediate element in such a manner as to prevent the elastically-deformable portion of the intermediate element from being subjected to inverse elastic deformation enabling it to become disengaged from said portion in relief.

Abstract: A valve for preventing fuel leaking from a fuel tank includes a housing that has a passage that communicates with the outside. In the housing there is a float that is used to open and close the passage by being moved axially along the housing. The valve is provided with a device to guide the float to close the passage. The device includes a gap formed between the housing and the float that increases in size with increasing distance from the passage.

Abstract: A vent control system having a closed biased vent valve is used to separate vapor and/or air from a liquid in an enclosed chamber. The closed biased vent valve has a float having an upwardly extending float arm which cooperates with a lever arm of the closed biased vent valve to prevent unintended release of vapor or liquid from the enclosed chamber. The upwardly extending float arm and the lever arm are coupled to one another when the float is located beneath a designated level in the enclosed chamber and are decoupled from one another when the float rises above the designated level. The vent control system is much less susceptible to vibration induced vent opening than a traditional vent valve. The vent control system is well suited for use in a fuel vapor separator that includes a housing having the enclosed chamber formed within it.

Abstract: A fuel vapor vent valve and method of making same for installation in an access opening of non-metallic fuel tanks. The valve body is formed of material not weldable to the tanks and an annular seal member formed of resilient material seals between the body upper portion exterior to the access opening and an overmold formed of material weldable to the tanks for retaining and sealing the valve thereon. In one embodiment the seal member is received in a groove and retained by a ring; and, in another embodiment the seal is formed by potting material cured in the groove prior to the overmolding.

Abstract: A float control valve for liquid treatment apparatus is located sufficiently far above the level of the liquid being treated that forces created by the liquid, or forces created during movement of the apparatus, do not harm the control valve or interfere with its functioning.

Abstract: A float operated fuel tank vent valve has a pair of vent passages with one of the pair larger than the other. A thin flexible elastomeric strip valve has one end attached to the valve body and the distal end bent over the top of the float and attached thereto. The strip valve has a pair of annular sealing surfaces formed thereon each disposed respectively opposite one of the vent passages. Upon refueling of the tank, as the float rises, the strip valve first progressively closes the larger vent passage and then progressively closes the smaller vent passage. As fuel is drawn from the tank by engine operation and the float is lowered, the strip valve is first peeled away from one edge of the smaller vent passage and then completely opens the smaller vent passage. As the float is further lowered, the valve strip is peeled away from one edge of the longer vent passage and then completely open the larger vent passage.

Abstract: A vent apparatus is adapted for use with a fuel tank to control venting of fuel vapor from the fuel tank. The vent apparatus comprises a fuel vapor vent outlet to discharge fuel vapor from the fuel tank. The vent apparatus comprises a normally open first valve module to serve as a fuel fill limit valve and close when the liquid level in the tank reaches a predetermined fill limit and a normally open second valve module to serve as a fuel fill limit valve and close when the liquid level in the tank reaches the predetermined fill limit. The first valve module and the second valve module cooperate to block communication between the fuel tank and the fuel vapor vent outlet when the vent apparatus is positioned in a non-tilted orientation relative to a horizontal and the level of liquid fuel in the fuel tank reaches the predetermined fill limit to close both valve modules.

Abstract: A device for ventilating a motor vehicle fuel tank comprises a chamber (24) communicating with the tank and, through a top outlet (30), with a discharge duct (28). The device further comprises, inside the chamber (24), a float (32) controlling a needle valve (40) for closing the top outlet (30) when the fuel level exceeds a predetermined threshold in the chamber (24). The device also comprises, between the tank and the float (32), flow restricting elements (66,68) for limiting the fuel displacement speed before it comes into contact with the float (32).

Abstract: A tank vent valve apparatus includes a valve housing formed to include an inlet port, an outlet port, and an interior region. The interior region is partitioned to define an intake chamber communicating with the inlet port, a discharge chamber communicating with the outlet port, and a float chamber containing a vent port valve and receiving liquid fuel and fuel vapor from the intake chamber. An interior wall defines a boundary between the float chamber and the discharge chamber and includes a valve seat formed to include a vent port therein. The vent port valve is buoyant and moves up and down along the interior wall as liquid fuel rises and falls in the float chamber to close and open the vent port.

Abstract: A liquid fuel trap device for a vehicle fuel tank, comprising a housing formed with a confined space with at least one inlet port each connectable to a corresponding fuel valve, an outlet port connectable to a fuel vapor recovery system, and a fuel liquid discharge valve adapted for discharging liquid fuel from the space into the tank. The housing further comprises a connecting arrangement for attaching the device on an inner surface of an upper wall of the fuel tank.

Abstract: A device (10) for venting a fuel tank has a chamber (17) communication on the one had with the tank and on the other hand, through an outlet orifice (19), with a pipe (20) for opening to atmosphere. A float (25) has an external skirt (27) delimiting an internal space in the float (25) and a needle (28) adapted to close off the outlet orifice (19) when the fuel level exceeds a predetermined threshold in the chamber (17). The float (25) has a least one partition (29) adapted to divide the internal space in the float (25), with a height substantially equal to the height of the external skirt (27).

Abstract: A fuel vapor vent valve and method of making same for installation in an access opening of non-metallic fuel tanks. The valve body is formed of material not weldable to the tanks and an annular seal member formed of resilient material seals between the body upper portion exterior to the access opening and an overmold formed of material weldable to the tanks for retaining and sealing the valve thereon. In one embodiment the seal member is received in a groove and retained by a ring; and, in another embodiment the seal is formed by potting material cured in the groove prior to the overmolding.

Abstract: A vent valve for a fuel tank having a sending unit positioned therethrough including a floating body floatable within the fuel tank and a valve positioned with respect to the floating body. A vent hose is positioned with respect to the valve, the vent hose extending between the floating body and the sending unit.

Abstract: In the fuel evaporative emission controller, mounting of the piping is simplified, and the amount of piping such as rubber hoses is minimized, reducing the cost and the fuel permeation. The fuel evaporative emission controller includes a valve structure integrating a fuel-level sensing valve and a fuel cut valve. It further includes a vent line and an evaporate line both provided in the valve structure. In the fuel evaporative emission controller having the vent line connected to the canister, the valve structure has an opening for communicating the vent line and evaporate line with each other.

Abstract: A ventilation valve cooperating with a breathing channel for a fuel tank of a helicopter has a safety device arranged in a valve housing of the ventilation valve. To seal the breathing channel from the tank when a connection between the fuselage cell and the tank is released or disrupted, e.g. in a crash, the safety device includes a spring-loaded plunger (15), a retainer (22), and a movable seal element (10). To allow the tank container to be filled essentially full, and to ensure the ongoing reliable functioning of the breathing channel, the seal element (10) is a buoyant valve ball (10) that seals the breathing channel (81) of the fuel extraction or discharge tank (4) if the fuel level (711) in the tank (4) rises up into the valve (8). Also, the breathing channel (81) is connected with the breathing channel (71) of a main fuel tank (3) by a connecting channel (9).

Abstract: A tank vent control system includes a valve container adapted to be mounted in a vehicle fuel tank and formed to include an interior chamber, a chamber inlet, a chamber outlet, and a valve positioned to move up and down in the interior chamber to control the flow of liquid fuel and fuel vapor from the interior chamber through the chamber outlet. The valve includes an outlet closure sized to engage and close the chamber outlet and an exterior wall. The valve container includes a lower interior portion bounding a lower region of the interior chamber and surrounding the exterior wall of the valve to define a vent passage therebetween communicating with the chamber inlet.

Abstract: A vent valve for use in controlling discharge of fuel vapor from a fuel tank. The vent valve includes a housing for attachment to the fuel tank includes a wall defining a cavity therein. The float is contained in the cavity of the housing and is responsive to the level of liquid in the fuel tank. The level in the fuel tank rises, the float rises within the housing. When the level of liquid in the fuel tank drops, the float moves downwardly in the housing. A passage is provided in the housing which communicates with an external portion of the tank. The vent valve includes at least one vent positioned proximate to and communicating with the passage for providing venting passage of vapor therethrough and to the passage. The vent valve includes a vent assembly having a flexible diaphragm which is displaceably positioned proximate to the passage to control the flow of vapor through the vent and through the passage.

Abstract: A vent control system having a closed biased vent valve is used to separate vapor and/or air from a liquid in an enclosed chamber. The closed biased vent valve has a float having an upwardly extending float arm which cooperates with a lever arm of the closed biased vent valve to prevent unintended release of vapor or liquid from the enclosed chamber. The upwardly extending float arm and the lever arm are coupled to one another when the float is located beneath a designated level in the enclosed chamber and are decoupled from one another when the float rises above the designated level. The vent control system is much less susceptible to vibration induced vent opening than a traditional vent valve. The vent control system is well suited for use in a fuel vapor separator that includes a housing having the enclosed chamber formed within it.

Abstract: A vent valve for a fuel tank having a sending unit positioned therethrough including a floating body floatable within the fuel tank and a valve positioned with respect to the floating body. A vent hose is positioned with respect to the valve, the vent hose extending between the floating body and the sending unit.

Abstract: A vent apparatus is adapted to be coupled to a fuel tank and includes a valve housing made of a non-weldable plastics material and containing a valve. The vent apparatus further includes a tank mount made of a weldable plastics material and coupled to the valve housing. The tank mount is adapted to be welded to an underlying fuel tank to support the valve housing within a mounting aperture formed in the fuel tank. The tank mount is coupled to the valve housing by a retainer ring formed to include an annular channel opening toward the valve housing. The valve housing includes an annular upper flange extending into an upper region of the annular channel formed in the retainer ring. The tank mount includes an annular lower flange extending into a lower region of that annular channel to mate with the overlying annular upper flange and trap a flange seal therebetween.

Abstract: A vacuum transfer system for transferring food grade products. A biased ball in a cage with a substantially uninterrupted cage wall is utilized as a check valve. The ball may be biased by a weight to float in a predictable orientation relative to the cage. The biased ball assures that a certain portion of the ball will consistently engage with an aperture. The biased ball also minimizes chattering of the ball in the cage under high flow conditions.

Abstract: An evaporative emission control system is provided which includes an upper valve casing defining a vent conduit, a lower valve casing disposed under the upper valve casing, and a float disposed within the lower valve casing. The float is vertically movable depending upon a liquid level of fuel in a fuel tank, and includes a valve portion that faces the upper valve casing. A valve port formed between the upper valve casing and the lower valve casing is opened and closed by the valve portion of the float. The upper valve casing defines a space between the vent conduit and the valve port. A flow restricting device is disposed in the space of the upper valve casing so as to obstruct flow of fuel from the valve port to the vent conduit.

Abstract: A fuel system apparatus for installation on a fuel tank. The apparatus includes a first portion extending at least partially interiorly of the fuel tank and the apparatus is installed on the fuel tank. A second portion is positioned at least partially extending into the fuel tank when the apparatus is installed on the fuel tank. A mount is provided which is at least partially retained between the first portion and the second portion. The mount at least partially extends from between the first portion and the second portion. The mount in size and dimension or at least substantially corresponding to an opening in the fuel tank to which the apparatus is attached. The mount is attachable to the fuel tank and prevents permeation of hydrocarbon vapor therethrough.

Abstract: A multi-function pressure relief valve having a moveable seat and a needle is mounted on a fuel vapor separator. The needle is connected to a float assembly for opening and closing the pressure relief valve for venting an internal chamber of the fuel vapor separator. The moveable seat is biased to engage the needle for relieving excess pressure when vapor pressure in the internal chamber exceeds a biasing force on the movable seat. The valve opens in response to at least one of (1) changing fluid level in the fuel vapor separator, and (2) excess vapor pressure within the vapor fuel separator. During operation, the valve vents an internal chamber of the fuel vapor separator by disengaging the needle from the movable seat using a float attached to the needle. The valve closes when the float reaches a desired position to pressurize the internal chamber by engaging the needle to the movable seat.

Abstract: A rubber component that provides a fuel seal is provided which includes a base formed principally of fluorosilicon rubber or hydrin rubber, and a coating layer applied by coating to the base and formed principally of nylon or fluorine-contained resin.

Abstract: A ventilation and/or a pressure-equalizing system for a fuel tank, in particular for a fuel tank of a motor vehicle, includes at least one aeration and/or de-aeration line leading into the fuel tank, via which the gases and/or vapors may be removed from or conducted into the fuel tank. A collection device for liquid fuel is coupled into the aeration and/or deaeration line, the collection device including at least two chambers, of which one is used as a temporary storage device for liquid fuel and is connected to a return line into the fuel tank.

Abstract: A fuel tank valve for connection to a degassing circuit to define a passage for a flow of gas leaving the tank, the valve being characterized by the fact that it has at least one moving member (18; 55) capable of being controlled in displacement to modify the configuration of said valve (1; 42), and by the fact that the valve has a first moving closure element (26; 65) having an orifice (29; 67) and suitable for being moved by the moving member (18; 55) from a first position towards a second position, the transition from the first position to the second position reducing the flow section made available to the flow of gas.

Abstract: Provided is a fuel cutoff valve that reduces the emission of fuel vapors from within fuel tanks. The fuel cutoff valve is mounted by partial insertion into a fixation hole provided in an upper tank wall of a fuel tank. The fuel cutoff valve comprises a cover, a casing, a float, and a spring. In the cover, a matrix of polyacetal having excellent resistance to fuel permeation reduces emission of fuel vapors into the atmosphere, while a dispersed phase of polyethylene in the matrix allows welding to fuel tank.