Stephen F Heath

US Patent:

39570258, May 18, 1976

Filed:

Nov 4, 1974

Appl. No.:

5/520606

Inventors:

Stephen D. Heath - Chula Vista CA
Lorenzo Borbolla - Dulzura CA

Assignee:

Rohr Industries, Inc. - Chula Vista CA

International Classification:

F02M 5100

US Classification:

123136

Abstract:

A vapor emission control system adapted to accommodate displaced vapors generated during the filling of a motor vehicle storage tank, wherein a first storage tank is adapted to communicate sequentially with an intermediate vacuum accumulator and ultimately with the intake manifold of an internal combustion engine. In the preferred embodiment a dispensing nozzle is inserted into vapor sealing engagement with a first liquid storage tank wherein said liquid storage tank is equipped with a unidirectional self venting gas cap. Upon insertion of the dispensing nozzle a unidirectional bypass line normally closed is opened via an entry port flap actuator. A regulated negative pressure head draws the displaced liquid fuel tank vapors sequentially through a first by pass valve, a first pressure regulator, a unidirectional check valve, a vacuum accumulator holding tank, a second unidirectional check valve which is also a flow regulator, a second pressure regulator, and finally into the intake manifold vacuum source of an internal combustion engine. An alternative embodiment is described wherein the liquid storage tank is vented directly to the atmosphere via conventional two way vent. In this embodiment upon insertion of the dispensing nozzle, the entry port flap actuator closes the vent line which is normally open and simultaneously opens the normally closed unidirectional displaced vapor line to the vacuum accumulator.