Fuel pump with and method to modulate vapor purge port pressure pulses
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United States of America Patent
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-
Nov 5, 1996
Grant Date -
N/A
app pub date -
Jun 13, 1995
filing date -
Jun 13, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary pump for volatile hydrocarbon fuels for use in a fuel system of an internal combustion engine of an automotive vehicle. A pulsation chamber allows purging of fuel vapor from the pump and dampens expansion and contraction of the fuel and vapor due to pressure pulses created during the pumping cycle thereby greatly reducing audible noise of the operating pump. The pulsation chamber has an axial passage with an outlet for returning fuel and vapor from the pulsation chamber to the fuel supply.
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