The cap assembly for a carbon canister fuel tank includes an outer cap and an inner cap. There is a cavity with an opening at the inner cap, and the outer cap is above the inner cap covering the opening. There is a lower vent cap in the cavity which divides the cavity into a filling cavity and a volume cavity. There is a through hole in the center of the lower vent cap with a breathing valve which would open automatically when there is air pressure imbalance in the filling cavity and volume cavity. The first vent hole is at the bottom of the volume cavity, while the second vent hole is at the bottom of the filling cavity. The first vent hole, breathing valve and the second vent hole are arranged in sequence to constitute the exhaust channel for the vaporizing oil gas in the fuel tank.

An auxiliary fuel tank for a flexible fuel vehicle is provided. The auxiliary fuel tank is mounted to an auxiliary tank body for storing gasoline fuel and is installed in an engine compartment of a flexible fuel vehicle. The auxiliary fuel tank includes a canister that is coupled to the auxiliary tank body and has activated carbon therein. The canister is configured to collect fuel evaporation gas generated in the auxiliary tank body to supply fuel components to an engine.

A fuel cap is constituted to close an upper portion of a tubular member constituting a filler opening of a fuel tank, and wherein the breather mechanism is constituted to discharge vaporized fuel separated by gas-liquid separation in a labyrinth path within the fuel cap through a breather drain hose supported at a side of the fuel tank, the fuel tank further comprising: a plate member fixed to a support member to support the fuel cap to the fuel tank; and a seal member to airtightly communicate an exit of the labyrinth path and an end portion of the breather drain hose when the fuel cap is closed. The breather drain hose connected to a lower side of the seal member is supported by the plate member.

A fuel dispensing system is disclosed to be equipped to a vehicle and to dispense fuel from the vehicle. The system includes a fuel tank, a selectively activated dispensing pump, a retractable flexible fuel line connected to the pump enabling storage of the fuel line within a body of the vehicle, and a dispensing nozzle attached to the fuel line.

A fuel tank assembly includes a fuel tank including a fuel inlet. A fuel cap is threadably engageable with the fuel inlet. The fuel cap has a grip provided for manipulation by a user. A vent path extends between a vent channel and the interior of the fuel tank. In a first configuration, the fuel cap is fully threaded to the fuel inlet to a fully closed position. The assembly is operable to transition to a second configuration in which the vent path is unobstructed and the fuel cap is fully threaded to the fuel inlet to the fully closed position. To enable unthreading of the fuel cap from the fuel inlet, the fuel tank assembly is operable to transition from the first configuration to the second configuration in response to a movement that does not alter the threaded engagement with the fuel inlet.

A fuel tank cap includes a casing; a main chamber disposed in the casing; a vapor vent channel disposed in the casing and communicating with the main chamber; annular partition walls disposed in the main chamber and configured to divide the main chamber into troughs, each partition wall including a cut so that the troughs are capable of communicating with each other via the cut; and activated carbon filled in the troughs. The vapor vent channel includes the cuts and the troughs. The activated carbon captures fuel vapors and absorbs VOCs in the fuel vapors when the fuel vapors pass through the vapor vent channel. The invention eliminates the low efficiency problem of capturing the harmful VOCs of the fuel vapors by the conventional activated carbon canister.

A fuel cap is described as having a top assembly and a bottom assembly slidably engaged with, and concentric to, the top assembly. The top assembly having a cap cover and a cylindrical cap body concentric with and protruding substantially perpendicularly from, an underside surface of the cap cover. The bottom assembly having a vacuum valve operatively coupled with a valve body. A wire-form keeper may slidably secure the bottom assembly to the top assembly. A pressure spring may impart a force that biases said bottom assembly away from said top assembly.

A fuel tank assembly includes a fuel tank including a fuel inlet. A fuel cap is threadably engageable with the fuel inlet. The fuel cap has a grip provided for manipulation by a user. A vent path extends between a vent channel and the interior of the fuel tank. In a first configuration, the fuel cap is fully threaded to the fuel inlet to a fully closed position. The assembly is operable to transition to a second configuration in which the vent path is unobstructed and the fuel cap is fully threaded to the fuel inlet to the fully closed position. To enable unthreading of the fuel cap from the fuel inlet, the fuel tank assembly is operable to transition from the first configuration to the second configuration in response to a movement that does not alter the threaded engagement with the fuel inlet.

The vertical shaft fuel tank cap with a charcoal canister includes a fuel tank inner cap and a fuel tank outer cap. A hollow room or cavity with an upper opening is disposed in the center of the fuel tank inner cap. The fuel tank outer cap is above the fuel tank inner cap. The ventilating cap or vent cap is disposed in the cavity and divides the cavity into a filling cavity and a containing cavity. The air outlet leading the fuel vapor to the containing cavity is on the bottom of the containing room. The air passageway is between the outer walls of the vent cap and an inner wall of the containing cavity. The fuel-absorption substrate is disposed in the filling cavity. The filtering performance of charcoal powder can be enhanced since it is exempted from long-time fuel soaking.

An auxiliary fuel tank for a flexible fuel vehicle is provided. The auxiliary fuel tank is mounted to an auxiliary tank body for storing gasoline fuel and is installed in an engine compartment of a flexible fuel vehicle. The auxiliary fuel tank includes a canister that is coupled to the auxiliary tank body and has activated carbon therein. The canister is configured to collect fuel evaporation gas generated in the auxiliary tank body to supply fuel components to an engine.