Patent ID: 6135429
Filing Date: 2000-10-24
Classification: F02M,Y10S

Abstract:
A carburetor for providing a fuel and air mixture to an engine, comprising:a body;a fuel metering diaphragm carried by the body and having two generally opposed sides and defining in part an air chamber on one side and a fuel chamber on its other side;a first fuel metering valve actuated by the fuel metering diaphragm;a fuel pump carried by the body and constructed to draw fuel from a supply tank and deliver fuel under pressure to the fuel chamber;a first passage communicating with the fuel pump;a second passage communicating with the air chamber and constructed to be in communication with a crankcase chamber of an engine; anda second valve movable between first and second positions and responsive to the pressure within the first passage generated by the fuel pump to move from its first position towards its second position when the pressure at the fuel pump is above a threshold pressure to prevent engine crankcase pressure pulses from materially affecting the pressure within the air chamber and acting on the fuel metering diaphragm, said second valve being open in one of said first and second positions and closed in the other of said first and second positions.