Fuel vapor emission control system employing fuel vapor tank

A method for refueling a fuel tank comprising:

• providing a fuel system comprising:
• a fuel tank having contained therein a liquid fuel and a fuel vapor;
• a fuel vapor tank in fluid communication with the fuel tank by means of a first fuel vapor conduit;
• and
• an engine in fluid communication with the fuel vapor tank by means of a second fuel vapor conduit;
• capturing, containing and compressing within the fuel vapor tank a quantity of the fuel vapor extracted from the fuel tank when at least either:
• the fuel tank is being refueled with an additional quantity of a liquid fuel whether or not the engine is operating;
• the engine is operating whether or not the fuel tank is being refueled;
• or
• the engine is shut down after having been operated.

A method for operating an engine comprising:

• providing a fuel system comprising:
• a fuel tank having contained therein a liquid fuel and a fuel vapor;
• a fuel vapor tank in fluid communication with the fuel tank by means of a first fuel vapor conduit;
• and
• an engine in fluid communication with the fuel vapor tank by means of a second fuel vapor conduit;
• capturing containing and compressing within the fuel vapor tank a quantity of the fuel vapor extracted from the fuel tank when at least either:
• the fuel tank is being refueled with an additional quantity of a liquid fuel whether or not the engine is operating;
• the engine is operating whether or not the fuel tank is being refueled;
• or
• the engine is shut down after having been operated;
• and
• restarting the engine while employing only the quantity of fuel vapor from the fuel vapor tank and not the liquid fuel from the fuel tank.