Fuel flow metering apparatus

A fuel flow metering apparatus for a carburetor responsive to activation of an operator controlled throttle for mixing a fuel from a storage tank with air for burning in an internal combustion engine, the carburetor defined by a carburetor housing having an air intake opening, an air-fuel discharge opening and an air-fuel mixing passageway extending through the housing between the air intake opening and the air discharge opening for drawing air in through the air intake opening in response to a partial vacuum created by the operation of the internal combustion engine and discharging a metered amount of the fuel in the air-fuel mixing passageway, the air-fuel mixture resulting therefrom being drawn through the air-fuel discharge opening into the engine in response to the partial vacuum, the direction of air flow through the housing defining a flow direction;

• a fuel reservoir housing defining therein a fuel reservoir having a fuel input port and a fuel discharge port;
• a fuel dispersion assembly mounted to the housing for dispersing the fuel form the reservoir into the air passing through air-fuel mixing passageway;
• a fuel flow metering means for variably regulating the flow of fuel from the fuel reservoir into the fuel dispersion assembly in response to the magnitude of the partial vacuum created by the operation of the internal combustion engine comprising;
• a pivotal metering cam having a variable radius metering surface;
• a metering rod extending through the fuel reservoir housing and having a first end postioned to bear against the metering surface and a second end positioned in the fuel reservoir;
• a ball valve;
• and
• a first spring positioned in the fuel discharge port to press against the ball valve whereby the ball valve is held against a second end of the reservoir metering rod, the first spring further pressing the reservoir meeting rod to bear against the metering surface, the fuel discharge port having therein a closure surface defined by a generally torus-like, inwardly narrowing, curved mouth transitioning to a frusto-conically tapered inner surface whereby pivotal movement of the metering disk causes longitudinal movement of the metering rod to variably increase and decrease the spacing between the ball valve and the closure surface whereby the flow of fuel through the fuel discharge port is increased or decreased respectively.