Diaphragm carburetor with air purge system
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United States of America Patent
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-
Apr 5, 2005
Grant Date -
Nov 11, 2004
app pub date -
May 6, 2003
filing date -
May 6, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A diaphragm carburetor-based fuel supply system is equipped with an air purge system that vents trapped air from the fuel supply system. The air purge system preferably includes a vent tube having an outlet opening into the upper portion of the system's fuel tank and an inlet located as close as practical to the diaphragm chamber of the carburetor, preferably within an internal passage of the carburetor or at least in a fitting or fuel supply tube portion located closely adjacent the fuel inlet of the carburetor. The resulting system requires only a few pull strokes to start a freshly fueled engine, as opposed to about 15 strokes in a system lacking such an air purge system. It also permits the use of a choke that is incapable of fully closing, thereby negating the need for a 'false hit' during cold engine start.
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