Patent ID: 6217008
Filing Date: 2001-04-17
Classification: F02M,Y10S

Abstract:
A diaphragm carburetor comprising a constant-pressure fuel chamber having an outlet bore and an inlet bore, a fuel nozzle, a fuel jet and a check valve, said fuel chamber communicating at said outlet bore with a lower end of said fuel nozzle through said fuel jet and check valve, a fuel passage communicating between said inlet bore in said constant-pressure fuel chamber and a fuel tank, a fuel pump communicating with said fuel passage for pumping fuel into said constant-pressure fuel chamber in response to a pulsation pressure from a pulsation pressure generating source, and a fuel introduction control valve for controlling the introduction of the fuel into said constant-pressure fuel chamber by opening and closing said inlet bore of said constant-pressure fuel chamber, said fuel introduction control valve having a cylindrical valve seat member mounted on an upper wall of said constant-pressure fuel chamber and having said inlet bore at an upper end thereof, and a valve member raised and lowered within said valve seat member to open and close said inlet bore, whereina fuel vapor treating chamber is provided in said fuel passage for finely dividing fuel vapor at a location before said inlet bore.