Fuel pump with and method to modulate vapor purge port pressure

Details Fuel pump with and method to modulate vapor purge port pressure Fuel pump with and method to modulate vapor purge port pressure

1995-06-13

1996-11-05

Vrablik, John J.

Rotary expansible chamber devices

Methods

418 15, 418171, 418180, F04C 208

Patent

active

055710034

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.

REFERENCES:
patent: 4697995 (1987-10-01), Tuckey
patent: 5263818 (1993-11-01), Ito et al.
patent: 5364246 (1994-11-01), Frank et al.

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