Carburetors are devices that can be used to mix fuel and air to power combustion engines typically including gasoline powered internal combustion spark ignited engines. A carburetor may include a fuel metering system that helps to control the amount of fuel supplied to air flowing through a mixing passage or main bore of the carburetor for mixing the fuel with air and supplying the mixture to the engine. Some metering systems employ a diaphragm that oscillates or reciprocates during operation to open and close a metering valve admitting fuel to a chamber from which it is supplied to the passage for mixing with air. In use, the large number of cycles experienced by such a diaphragm which typically physically interacts with other components of the metering system such as a valve actuating lever, and continuous exposure to solvent containing fuels, can result in a harsh operating environment that causes wear, degradation and ultimately failure of the diaphragm. In a gasoline powered spark ignited internal combustion so-called small engine the diaphragm must fully open the valve when subjected to only a small pressure differential which is typically a maximum negative pressure of −0.9956 kPa or −0.1444 pounds per square inch and usually about −0.50 kPa or −0.0725 pounds per square inch (psi). This very small differential operating pressure also requires that the portion of the diaphragm within a fuel metering chamber be very flexible particularly since such diaphragm may have a surface area within the metering chamber in the range of about 0.5 square inch to 1.0 square inch.