A venting system for a fuel tank, comprising: a first vent valve through which fuel vapor may be vented from the fuel tank, being responsive to the level of liquid in the fuel tank to prevent fuel vapor in the fuel tank from venting through the first vent valve when the liquid fuel in the fuel tank causes the first vent valve to close, and being locatable within a first chamber of the fuel tank; and a second vent valve through which fuel vapor may be vented from the fuel tank, being responsive to the level of liquid in the fuel tank to prevent fuel vapor in the fuel tank from venting through the second vent valve when the liquid fuel in the fuel tank causes the second vent valve to close, and being locatable 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; characterized by a rigid support carrying both the first and second vent valves (22, 24) and the rigid support being adapted to be movably carried within the fuel tank to vary the height of the first and second valves (22, 24) within the fuel tank; the rigid support including a stem adapted to be carried by the fuel tank and about which the rigid support and the first and second valves (22, 24) pivot relative to the fuel tank about an axis, and as the rigid support pivots one of the first and second vent valves (22, 24) is raised within the fuel tank and the other of the first and second vent valves (22, 24) is lowered within the fuel tank; and the rigid support pivots when liquid fuel acts on and displaces one of the vent valves (22, 24) with a greater force than a force acting on the other vent valve. a first vent valve through which fuel vapor may be vented from the fuel tank, being responsive to the level of liquid in the fuel tank to prevent fuel vapor in the fuel tank from venting through the first vent valve when the liquid fuel in the fuel tank causes the first vent valve to close, and being locatable within a first chamber of the fuel tank; and a second vent valve through which fuel vapor may be vented from the fuel tank, being responsive to the level of liquid in the fuel tank to prevent fuel vapor in the fuel tank from venting through the second vent valve when the liquid fuel in the fuel tank causes the second vent valve to close, and being locatable 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; characterized by a rigid support carrying both the first and second vent valves (22, 24) and the rigid support being adapted to be movably carried within the fuel tank to vary the height of the first and second valves (22, 24) within the fuel tank; the rigid support including a stem adapted to be carried by the fuel tank and about which the rigid support and the first and second valves (22, 24) pivot relative to the fuel tank about an axis, and as the rigid support pivots one of the first and second vent valves (22, 24) is raised within the fuel tank and the other of the first and second vent valves (22, 24) is lowered within the fuel tank; and the rigid support pivots when liquid fuel acts on and displaces one of the vent valves (22, 24) with a greater force than a force acting on the other vent valve.