Patent ID: 9677506
Date: 2017-06-13
CPC Classifications: B01F,F02M

Claim:
1. A carburetor that provides a supplemental fuel supply to an engine, comprising: a body having an air-fuel passage from which a fuel and air mixture flows from the carburetor, and a fuel metering chamber from which fuel flows to the air-fuel passage; a fuel metering diaphragm defining part of the fuel metering chamber and having at least a portion that is movable relative to the body to increase and decrease the volume of the fuel metering chamber to control fuel flow in the fuel metering chamber, the fuel metering diaphragm also defining part of a metering reference chamber that is separate from the fuel metering chamber; and a fluid pump carried by the carburetor or carried by another component upstream of the carburetor relative to the direction of air flow through the carburetor and having a pump chamber with an an outlet in fluid communication with the metering reference chamber and an actuator arranged to discharge air through the outlet to increase the air pressure within the metering reference chamber and thereby increase the fuel flow rate from the fuel metering chamber into the air-fuel passage to provide a supplemental fuel supply to the engine.