Patent ID: 6715737
Filing Date: 2004-04-06
Classification: F02M,Y10S

Abstract:
A fuel metering system for a combustion engine carburetor comprising:a body of the carburetor; a flat flexible diaphragm having a first side, an opposite second side and a periphery engaged to the body; a fuel metering chamber defined between the body and the first side of the diaphragm; a reference chamber defined between the body and the opposite second side of the diaphragm; a flow control valve being operatively associated with the first side of the diaphragm; wherein the flat diaphragm flexes into the fuel metering chamber when fuel pressure within the metering chamber is less than the reference pressure of the reference chamber thereby causing the flow control valve to open, and wherein the flat diaphragm returns to datum when the pressure within the metering chamber equals the pressure within the reference chamber causing the flow control valve to close; and wherein the flat diaphragm is a composite material made of a synthetic woven fabric impregnated with a synthetic rubber forming a thin homogeneous sheet that swells between a range of two to ten percent for increasing flexibility.