An engine (1) includes: a piston (9); a carburetor (25) having a diaphragm fuel pump (109), the diaphragm fuel pump (109) including a pump chamber (1118) configured to suck and discharge fuel and a diaphragm chamber (110) to which a pressure to drive the p...

A composite control valve is constructed by a valve housing, first and second diaphragms mounted to the valve housing and disposed to be opposed to each other, a negative pressure working chamber defined between the first and second diaphragms to communica...

In a fuel supply control system for an engine in which a valve housing is provided with a negative pressure working chamber, and a negative pressure responsive-type control valve operable to be opened and closed in response to generation and extinction of ...

A diaphragm carburetor-based fuel supply system (46) is equipped with an air purge system (48) that vents trapped air from the fuel supply system (46). The air purge system (48) preferably includes a vent tube (90) having an outlet opening (94) into the up...

A fuel metering system for a combustion engine carburetor utilizes a non-convoluted, planar, flexible diaphragm which does not require a molding process to form a traditional convolution. The diaphragm defines in part a pressure controlled fuel metering ch...

Method of and mechanism for regulating fuel feed from a rotary valve type carburetor to an associated engine. A carburetor bypass air passage variably communicates the throttle valve hole with a bypass air source at engine idle setting of the throttle valv...

A fuel metering assembly for a diaphragm type carburetor has a fuel metering diaphragm with at least two convolutions or annular projections providing greater travel of the diaphragm and more consistent movement of the diaphragm throughout its stroke or tr...

A carburetor with a valve assembly having a plastic cam body connected to a plastic shaft which extends into the carburetor body and a valve head press-fit into a slot formed through the plastic shaft. Desirably, the valve assembly eliminates the use of th...

A method of reducing gaseous phase presence in the liquid fuel metering chamber of a diaphragm by providing a "High-Point Pick Up" hole positioned in the optimal metering chamber location (highest) to assure maximum purge evacuation of air and/or other gas...

An improved fuel flow control device of a diaphragm-type carburetor having a lever (34) which can be easily coupled to a flow control valve body (70). The lever has a resilient portion (65) which flexes to permit a cooperating portion (72) of the valve bod...