Abstract: A control valve for use in an automotive fuel pump. A housing is installed in the fuel pump and has a central circular opening therethrough the peripheral surface of which is curved. A valve member is movable relative to the circular opening and has an outer curved contact surface for sealingly contacting the curved peripheral surface to prevent flow of a fuel through the opening. The curved surface of the valve member tangentially contacts the curved peripheral surface to seal against flow. A coil compression spring seats against one end of the housing and continuously urges the valve member into sealing contact with the curved peripheral surface.

Abstract: A shut-off valve for the automotive fuel system is operable to shut off the fuel flow whenever a positive pressure exists in the fuel line between the fuel tank and the shut-off valve. The shut-off valve may be employed in combination with a fuel pump or may be employed separately in the fuel line and comprises a flexible diaphragm connected by a stem directly to the valve member and movable with the valve member. The diaphragm air chamber has an air vent controlled by a vent valve providing a relatively large opening for bleeding in air and providing a relatively small opening for exhausting air from the diaphragm air chamber. The vent valve thus permits a relatively fast movement of the valve member to an open position and a relatively slow or restricted movement of the valve member toward a closed or partially closed position.