Controlling evaporative emissions in a fuel system
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United States of America Patent
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Sep 16, 2008
Grant Date -
Nov 29, 2007
app pub date -
Jul 27, 2007
filing date -
May 23, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods and fuel systems to reduce evaporative emissions of a volatile fuel. A fuel tank contains fuel, a carburetor mixes air with the fuel from the fuel tank, and a plurality of fluid paths route fuel amongst and/or between the fuel tank and the carburetor. A valve actuation device stops flow of fuel in one or more of the plurality of fluid paths and the carburetor is adapted to be drained of fuel during engine shutdown to reduce or prevent evaporative emissions from the fuel system. The carburetor is preferably designed so as to minimize a volume of fuel contained therein.
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