An ejector assembly: a pressure regulator in fluid communication with an ejector, the pressure regulator receiving boost pressure and selectively allowing the boost pressure to pass through a valve opening therein under selected conditions and into the ejector as regulated boost pressure; wherein the pressure regulator, comprises: a first conduit defining a first passageway that includes a first Venturi gap separating the first passageway into a first converging section and a first diverging section that both narrow toward the first Venturi gap; and a valve mechanism comprising a gate member received in the first Venturi gap and operatively movable to open and close the first Venturi gap, wherein the gate member has a through passage therein defining an open position; and an actuator having a piston operatively connected to the valve mechanism for movement therewith to control a flow of the boost pressure through the passage in the gate member; wherein the ejector comprises: a second conduit defining a second passageway that includes a second Venturi gap separating the second passageway into a second converging section and a second diverging section that both narrow toward the second Venturi gap; characterized in that the ejector further comprises an upper body portion defining a first suction port in fluid communication with the second Venturi gap, wherein suction is created by a draw of fluid from the first suction port into the second Venturi gap. a pressure regulator in fluid communication with an ejector, the pressure regulator receiving boost pressure and selectively allowing the boost pressure to pass through a valve opening therein under selected conditions and into the ejector as regulated boost pressure; wherein the pressure regulator, comprises: a first conduit defining a first passageway that includes a first Venturi gap separating the first passageway into a first converging section and a first diverging section that both narrow toward the first Venturi gap; and a valve mechanism comprising a gate member received in the first Venturi gap and operatively movable to open and close the first Venturi gap, wherein the gate member has a through passage therein defining an open position; and an actuator having a piston operatively connected to the valve mechanism for movement therewith to control a flow of the boost pressure through the passage in the gate member; a first conduit defining a first passageway that includes a first Venturi gap separating the first passageway into a first converging section and a first diverging section that both narrow toward the first Venturi gap; and a valve mechanism comprising a gate member received in the first Venturi gap and operatively movable to open and close the first Venturi gap, wherein the gate member has a through passage therein defining an open position; and an actuator having a piston operatively connected to the valve mechanism for movement therewith to control a flow of the boost pressure through the passage in the gate member; wherein the ejector comprises: a second conduit defining a second passageway that includes a second Venturi gap separating the second passageway into a second converging section and a second diverging section that both narrow toward the second Venturi gap; characterized in that the ejector further comprises an upper body portion defining a first suction port in fluid communication with the second Venturi gap, wherein suction is created by a draw of fluid from the first suction port into the second Venturi gap.