Abstract: In an internal combustion engine with exhaust means and a carburetor including a fuel bowl, means are provided for delivering fuel to the fuel bowl at a pressure varying in response to the output signal of an air-fuel ratio sensor in the exhaust means to maintain a substantially constant air-fuel ratio to the engine. The fuel supply means may comprise, for example, an electric fuel pump whose input power is varied according to the sensor signal.

Abstract: A fuel carburetor structure is shown having a main fuel bowl or reservoir with a second fuel reservoir therein; a fuel inlet valve assembly for controlling the rate of fuel flow to both the main and second or auxiliary reservoirs is shown as having a needle-like inlet valve positioned by a float carried within the main reservoir and responsive to the level of the fuel contained therein; additional valving means resiliently resists the flow of fuel into the main reservoir and the degree of such resilient resistance is reflective of the degree to which the needle-like inlet valve has been moved toward its fully closed position; the additional valving means also serves to cause a flow of fuel from the needle-like inlet valve to the auxiliary reservoir via related conduit means.

Abstract: The level of fuel in the float bowl of a carburetor is controlled by a semi-spherical inlet valve that is carried by an ambient pressure responsive aneroid-toroidal float assembly in position to coact with a vertically adjustable seat on a fuel inlet whereby the level of fuel in the float bowl is compensated for pressure and altitude variations.

Abstract: A carburetor provided with a rocking member which will be able to forcibly move a needle valve to a valve closing position through a float when a carburetor body inclines by an angle larger than a predetermined angle from a normal position, in order to prevent the overflow of a fuel caused by continuously flowing into the float chamber from a fuel tank when the carburetor body inclines extremely.