Fuel system with air venting and fuel anti-drainback
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United States of America Patent
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May 18, 2010
Grant Date -
Feb 14, 2008
app pub date -
Aug 14, 2006
filing date -
Aug 14, 2006
priority date (Note) -
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Abstract
A fuel system of an engine is provided with a venting assembly to vent air that accumulates within a fuel filter of the fuel system and provides anti-drainback of clean fuel back toward the fuel filter when the engine is turned off. In one embodiment, the venting assembly includes a piston valve that provides both the vent and anti-drainback. The valve is actuatable by fluid pressure to a first position that restricts drainback, a second position that restricts venting, and intermediate positions between the first and second positions which permit venting.
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