Motor vehicle fuel system with internal vapor reservoir

Details Motor vehicle fuel system with internal vapor reservoir Motor vehicle fuel system with internal vapor reservoir

1995-11-13

1996-09-03

Miller, Carl S.

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

123510, 137 38, F02M 3302

Patent

active

055514057

ABSTRACT:
A motor vehicle fuel system is provided. The fuel system includes a fuel tank which has an upper wall portion and defines a first interior volume for storing fuel therein. The first interior volume includes a first ullage space adjacent the upper wall portion. The fuel system of the present invention also includes a generally cup-shaped vapor reservoir carried within the first interior volume. The reservoir has vertically extending sides, a horizontally extending top and an open bottom operative to define a second interior volume open to the bottom of the fuel tank. The second interior volume includes a second ullage space in fluid communication with the first ullage space. Fluid communication between the first and second ullage spaces is effected by providing a small bleed orifice and a large orifice arranged in parallel fluid relationship with the small bleed orifice in the top of the reservoir. A valve device which normally closes the large orifice during reflecting of the vehicle is movable between a closed position and an open position in response to acceleration of the vehicle.

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