FUEL METERING DIAPHRAGM WITH BACKING PLATE

摘要

In at least some implementations, a carburetor having a fuel metering system including a diaphragm assembly that moves in response to pressure changes in a metering chamber to actuate a metering valve may include a flexible diaphragm adapted to carried by a body of the carburetor at a periphery to define part of the metering chamber. The portion of the diaphragm that defines part of the metering chamber defines a chamber projected area of the diaphragm. A backing plate is attached to the flexible diaphragm and arranged to be located outside the metering chamber. The backing plate having an outer perimeter defining a plate projected area, wherein an area ratio of the plate projected area to the chamber projected area is greater than about 0.1.