Fuel system
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United States of America Patent
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Jul 29, 2014
Grant Date -
Oct 2, 2008
app pub date -
Mar 12, 2008
filing date -
Mar 27, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A fuel system comprises a first, variable displacement fuel pump operable to supply fuel through a metering valve to an engine, a control servo operable to control the operation of the first pump, a pressure drop control valve (PDCV) responsive to a pressure drop across the metering valve, a second fuel pump, and a spill valve movable between an open position in which substantially all of the fuel supplied by the second fuel pump is returned to an inlet side thereof, and a closed position, or partially closed position, wherein a proportion of the fuel supplied by the second pump is delivered to the engine.
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