An engine comprising: a fuel tank; a carburetor including a throttle valve movable between a first throttle position and a second throttle position; a governor system configured to move the throttle valve; a speed control lever coupled to the governor system and movable between a first position corresponding to the first throttle position and a second position corresponding to the second throttle position; and a transport valve fluidly coupled between the fuel tank and the carburetor, the transport valve including: a valve seat; a valve element; a float coupled to the valve element; and a valve cavity, wherein the float is structured so that a floatation bias is provided when fuel is present in the valve cavity; wherein the valve element is moveable relative to the valve seat between an open valve position allowing fuel flow between the fuel tank and the carburetor, and a closed valve position preventing fuel flow between the fuel tank and the carburetor, wherein movement of the speed control lever to the second position moves the valve element to the closed valve position to stop fluid flow between the fuel tank and the carburetor and moves the throttle valve to the second throttle position; the engine further comprising: a cam coupled to the speed control lever and actuatable between an on-state and an off-state, wherein when the speed control lever is arranged in the second position, the cam is in the off-state; a cam follower arranged to urge the valve element toward the closed valve position when the cam is in the off-state, and a spring biasing the cam follower toward the cam; a diaphragm positioned between the valve element and the cam follower; and a spring biasing the valve element toward the closed valve position, wherein in order for fuel to flow past the valve seat, the floatation bias of the float must overcome the bias of the spring and the diaphragm. a fuel tank; a carburetor including a throttle valve movable between a first throttle position and a second throttle position; a governor system configured to move the throttle valve; a speed control lever coupled to the governor system and movable between a first position corresponding to the first throttle position and a second position corresponding to the second throttle position; and a transport valve fluidly coupled between the fuel tank and the carburetor, the transport valve including: a valve seat; a valve element; a float coupled to the valve element; and a valve cavity, wherein the float is structured so that a floatation bias is provided when fuel is present in the valve cavity; wherein the valve element is moveable relative to the valve seat between an open valve position allowing fuel flow between the fuel tank and the carburetor, and a closed valve position preventing fuel flow between the fuel tank and the carburetor, a valve seat; a valve element; a float coupled to the valve element; and a valve cavity, wherein the float is structured so that a floatation bias is provided when fuel is present in the valve cavity; wherein the valve element is moveable relative to the valve seat between an open valve position allowing fuel flow between the fuel tank and the carburetor, and a closed valve position preventing fuel flow between the fuel tank and the carburetor, wherein movement of the speed control lever to the second position moves the valve element to the closed valve position to stop fluid flow between the fuel tank and the carburetor and moves the throttle valve to the second throttle position; the engine further comprising: a cam coupled to the speed control lever and actuatable between an on-state and an off-state, wherein when the speed control lever is arranged in the second position, the cam is in the off-state; a cam follower arranged to urge the valve element toward the closed valve position when the cam is in the off-state, and a spring biasing the cam follower toward the cam; a diaphragm positioned between the valve element and the cam follower; and a spring biasing the valve element toward the closed valve position, wherein in order for fuel to flow past the valve seat, the floatation bias of the float must overcome the bias of the spring and the diaphragm. a cam coupled to the speed control lever and actuatable between an on-state and an off-state, wherein when the speed control lever is arranged in the second position, the cam is in the off-state; a cam follower arranged to urge the valve element toward the closed valve position when the cam is in the off-state, and a spring biasing the cam follower toward the cam; a diaphragm positioned between the valve element and the cam follower; and a spring biasing the valve element toward the closed valve position, wherein in order for fuel to flow past the valve seat, the floatation bias of the float must overcome the bias of the spring and the diaphragm.