Abstract: A fuel injection system that includes an injector having a pintle movable within a housing for selectively opening and closing communication between inlet and outlet ports in the housing. The inlet port is connected to a source of fuel under pressure, while the outlet port is connected to a nozzle for delivering fuel under pressure to the engine. A section of magnetic material is coupled to the pintle, and a permanent magnet is mounted on the engine flywheel, such that magnetic forces imparted as the permanent magnet moves therepast moves the pintle against a spring to open communication between the inlet and outlet ports, and thereby deliver fuel under pressure from the source to the nozzle. A cam mechanism is rotatably positioned within the pintle housing and operatively coupled to the pintle for adjustably varying stroke of the pintle within the housing, and thereby varying time duration during which the injector opens communication between the fuel source and the nozzle.

Abstract: A two-stage fuel delivery system for an internal combustion engine that includes a first stage pump having a first pump chamber with an inlet coupled to a fuel source, an outlet and a diaphragm responsive to pressure pulsations from the engine crankcase for reciprocation within the chamber. A second stage pump includes a second pump chamber having an inlet coupled to the outlet of the first chamber, an outlet for delivering fuel under pressure to engine fuel injectors or the like, a permanent magnet for mounting on the flywheel of the engine for rotation in synchronism with operation of the engine, and a diaphragm in the second chamber operatively coupled to the magnet for reciprocation with the second chamber responsive to rotation of the magnet to pump fuel from the inlet to the outlet of the second chamber.

Abstract: A carburetor for an internal combustion engine has at least two air passageways through which air is drawn into the engine, at least one fuel circuit for each air passageway through which fuel is drawn from a source thereof into the passageway and mixed with air passing therethrough to produce an air-fuel mixture combusted in the engine. The amount of fuel flowing through each fuel circuit is a function of the sub-atmospheric air pressure level to which each fuel circuit is subjected. An improvement comprises apparatus for balancing the fuel flow in the fuel circuits with the pressure level in each fuel circuit being sensed, the pressure levels in the fuel circuits differing as a result of the flow characteristics thereof. Air is introduced into one of the fuel circuits to modulate the quantity of fuel flowing therethrough.

Abstract: A multiple stage carburetor has a linkage releasably connecting the secondary throttle for rotation with the primary throttle to open the second stage. A latch member for the linkage is movable between latched and unlatched positions and only when the latch member is in a latched position is the linkage connected for rotation of the secondary throttle. A diaphragm unit operated from a vacuum line to the intake manifold moves the latch member between latched and unlatched positions. A bimetallic element independent of the choke valve controls an air bleed to the vacuum line and is positioned to sense the normal operating temperature of the engine for movement of the latch member to latched position and subsequent opening of the second stage when such temperature is reached.