Timothy Michael Grifka

6533254, Mar 18, 2003

Oct 5, 2001

09/971839

Timothy K. Grifka - Ubly MI
Bradley D. Hilbig - Rio Rico AZ
Anthony M Kueffner - Frankenmuth MI
Paul S. Learman - Bad Axe MI

Walbro Corporation - Cass City MI

F02M 116

261 35, 12317911, 137846, 137847, 261DIG 8

A carburetor for a small internal combustion engine has a manual priming fuel pump with a resilient valve for allowing fuel flow in a first direction and for preventing fuel flow in a second direction. The resilient valve is reinforced with longitudinally extending ribs to prevent recirculation of fuel through an outlet orifice of the valve in a running engine. The outlet orifice is defined by a distal end of a tubular portion of the valve press fitted and projecting into an outlet passage that communicates with a pump chamber defined by a resilient domed cap. The ribs project laterally outward from the tubular portion within the outlet passage. Integral with an opposite end of the resilient valve is a head which flexes outward to open an inlet passage which then communicates with the pump chamber.

6615792, Sep 9, 2003

May 6, 2002

10/139428

Timothy K. Grifka - Ubly MI
Terry O. Hendrick - Cass City MI
Kevin L. Israelson - Cass City MI
Eric L. King - Caro MI
Albert L. Sayers - Caro MI
John C. Woody - Caro MI

Walbro Engine Management LLC - Cass City MI

F02B 7700

123198DB, 123DIG 11

A fuel shut-off system for a carburetor substantially reduces or prevents the delivery of fuel to an engine when the engine is turned off and as it coasts to a stop. The fuel shut-off system preferably reduces or eliminates the pressure differential across a nozzle through which fuel is delivered from a fuel chamber through a fuel-and-air mixing passage of the carburetor and into the engine. In this manner, the flow of fuel through the nozzle is reduced and preferably eliminated immediately upon engine turn-off to prevent the after-fire and associated problems within a residually hot exhaust system. The system incorporates an actuator, preferably a solenoid valve, having a first position which obstructs a vacuum bypass passage communicating between the fuel chamber and the fuel-and-air mixing passage, and a second position which enables communication between the vacuum bypass passage and a fuel chamber passage which otherwise communicates with a near atmospheric pressure source.

6454246, Sep 24, 2002

Nov 17, 2000

09/715999

Timothy K. Grifka - Ubly MI
Terry O. Hendrick - Cass City MI
Kevin L. Israelson - Cass City MI
Eric L. King - Caro MI
Albert L. Sayers - Caro MI
John C. Woody - Caro MI

Walbro Corporation - Cass City MI

F02M 512

261 70, 261DIG 39

A carburetor has an upper body and a lower separate nozzle post member that extends into the fuel chamber of a lower fuel bowl. The nozzle post member has a main nozzle mixing passage leading from a main fuel jet inlet to a nozzle. An annular air passage and an annular idle fuel passage surround the mixing passage. The nozzle post member also has integrally formed brackets to pivotally mount the fuel float.