Abstract: A nozzle inhibitor is included in a fuel tank filler neck closure assembly. The nozzle inhibitor blocks full insertion of a small-diameter unleaded fuel nozzle into the filler neck closure assembly yet allows full insertion of a large-diameter diesel fuel nozzle into the filler neck closure assembly.

Abstract: A fuel cap includes a filler-neck closure including a pressure-relief valve and a vacuum-relief valve and a handle arranged to overlie the filler-neck closure. The fuel cap also includes a torque-transmission ring arranged to lie between the handle and the filler-neck closure.

Abstract: A fuel gauge is adapted to extend into a fuel tank to enclose liquid fuel in the fuel tank and to sense the level of liquid fuel in the fuel tank. The fuel gauge includes a fuel-level indicator having a needle and a buoyant float exposed to the liquid fuel in the fuel tank. The needle moves in response to changes in the level of liquid fuel in the fuel tank sensed by the buoyant float.

Abstract: A nozzle inhibitor is positioned in a filler neck closure assembly to prevent a user from pumping unleaded fuel into a diesel fuel tank. The nozzle inhibitor blocks full insertion of a small-diameter unleaded fuel nozzle into the filler neck closure assembly yet allows full insertion of a large-diameter diesel fuel nozzle into the filler neck closure assembly.

Abstract: A filler neck cap includes a vacuum-relief valve member that moves from a normally closed position to an opened position when exposed to certain vacuum conditions to open a vent aperture and allow atmosphere to flow therethrough. The filler neck cap also includes a pressure-relief valve member formed to include the vent aperture that is closed normally by the vacuum-relief valve member.

Abstract: A vent apparatus is opened to allow free flow of fuel vapor from a vehicle fuel tank through the vent apparatus to a fuel vapor recovery canister during tank refueling until a predetermined level of liquid fuel is reached in the vent apparatus. Once refueling has been completed, the vent apparatus is closed to block or limit further flow of liquid fuel to the vent apparatus. At the same time, fuel vapor discharge passageways in the vent apparatus that had been closed once the fuel tank had been filled to a predetermined capacity with liquid fuel are reopened so that fuel vapor can flow freely from the fuel tank to the canister even though the volume or height of liquid fuel in the fuel tank has not decreased since the tank was filled during refueling.

Abstract: A fuel tank filler neck apparatus includes a filler neck and a filler neck component mounted in a fuel-conducting passageway formed in the filler neck. The filler neck component could be a fuel tan inlet check valve or a closure cap mount.

Abstract: A carbon canister includes a housing and a carbon bed located in the housing. A discharge tube is coupled to the housing and arranged to conduct fuel vapor from the canister to a vapor-delivery system coupled to an engine to clean the carbon bed in the housing.

Abstract: A power source is provided for a machine. The power source includes an engine and an engine fuel system of the type that generates fuel vapor containing hydrocarbon material.

Abstract: A nozzle inhibitor is included in a fuel tank filler neck closure assembly. The nozzle inhibitor blocks full insertion of a small-diameter unleaded fuel nozzle into the filler neck closure assembly yet allows full insertion of a large-diameter diesel fuel nozzle into the filler neck closure assembly.

Abstract: A fuel vapor recovery apparatus includes a canister including a housing formed to include a first port exposed to the atmosphere and a second port exposed to fuel tank fuel vapor. A carbon bed is located in an interior region of the housing between the first and second ports.

Abstract: A vehicle fuel system includes a fuel vapor recovery canister containing a carbon bed configured to capture hydrocarbon material associated with fuel vapor discharged from the fuel tank into the canister. A purge vacuum is applied to the canister to draw fuel vapor carrying reclaimed hydrocarbon material from the canister into an intake manifold coupled to an engine so that the reclaimed hydrocarbon material can be burned in the engine.

Abstract: A tank venting system includes a diaphragm valve movable to open and close a passageway leading to a fuel tank. The system also includes a fuel vapor recovery canister used to adsorb hydrocarbons associated with fuel vapor flowing through the passageway.

Abstract: A filler neck closure system includes a capless fuel tank filler neck and a closure. The closure is coupled to the capless fuel tank filler neck to close an opening into the fuel tank filler neck.

Abstract: A filler neck closure unit includes a filler neck closure cap and a breakaway tether coupled to the cap. The breakaway tether includes a weakened, frangible section.

Abstract: A nozzle inhibitor is positioned in a filler neck closure assembly to prevent a user from pumping unleaded fuel into a diesel fuel tank. The nozzle inhibitor blocks full insertion of a small-diameter unleaded fuel nozzle into the filler neck closure assembly yet allows full insertion of a large-diameter diesel fuel nozzle into the filler neck closure assembly.

Abstract: A multi-layer shell is configured to provide a fuel tank and a fuel tank filler neck. One layer has a low-permeation material configured to inhibit hydrocarbon permeation.

Abstract: A nozzle inhibitor is positioned in a filler neck closure assembly between a pivotable outer door and a pivotable inner door to prevent a user from pumping unleaded fuel into a diesel fuel tank. The nozzle inhibitor blocks full insertion of a small-diameter unleaded fuel nozzle into the filler neck closure assembly yet allows full insertion of a large-diameter diesel fuel nozzle into the filler neck closure assembly.

Abstract: A fuel tank filler neck is formed to include an opening. A filler neck closure system includes a closure and a lock for the closure.

Abstract: A vent apparatus includes a vent housing adapted to be mounted on a fuel tank to extend into an interior region of the fuel tank and a fuel vapor discharge conduit leading from the vent housing to a fuel vapor recovery canister. The vent apparatus further includes a discharge regulator configured to regulate flow of fuel vapor from the vent housing into the fuel vapor discharge conduit.