Fuel tank venting system

A fuel tank assembly, comprising:

• a fuel tank having a first chamber, a second chamber and a tank wall separating the first chamber from the second chamber during at least certain levels of fuel within the fuel tank,
• a first vent valve having an inlet through which fuel vapor may enter and an outlet through which fuel vapor may be vented from the fuel tank, and a liquid responsive valve that prevents fuel vapor from venting out of the outlet when the level of liquid fuel in the fuel tank causes the liquid responsive valve to close, the first vent valve being located within the first chamber of the fuel tank;
• a second vent valve having an inlet through which fuel vapor may enter and an outlet through which fuel vapor may be vented from the fuel tank, and a liquid responsive valve that prevents fuel vapor from venting out of the outlet when the level of liquid fuel in the fuel tank causes the liquid responsive valve to close, the second vent valve being located within the second chamber of the fuel tank;
• and
• a support having a first inlet communicated with the outlet of the first vent valve, a second inlet communicated with the outlet of the second vent valve and an outlet through which fuel vapor vented from the outlet of one or both of the first and second vent valves may flow, the support carrying both the first and second vent valves within the fuel tank and the support being movably carried within the fuel tank to vary the height of the first and second valves within the fuel tank.

A venting system for a fuel tank, comprising:

• a first vent valve having an inlet through which fuel vapor may enter and an outlet through which fuel vapor may be vented from the fuel tank, and a valve that prevents fuel vapor from venting out of the outlet when the level of liquid fuel in the fuel tank causes the valve to close, the first vent valve being located within a first chamber of the fuel tank;
• a second vent valve having an inlet through which fuel vapor may enter and an outlet through which fuel vapor may be vented from the fuel tank, and a valve that prevents fuel vapor from venting out of the outlet when the level of liquid fuel in the fuel tank causes the valve to close, the second vent valve being located within a second chamber of the fuel tank that is separate from the first chamber of the fuel tank during at least certain fuel level conditions within the fuel tank;
• and
• a support carrying both the first and second vent valves within the fuel tank and being carried within the fuel tank for pivoted movement relative to the fuel tank to vary the height of the first and second valves within the fuel tank as the support moves relative to the fuel tank.