Abstract: A carburetor improvement comprises a flow passage through which fuel vapors created in a fuel bowl are drawn off to a chamber having a first outlet through which fuel vapors are directed to a canister and a second outlet through which fuel vapors are directed to an air passage in the carburetor. A solenoid includes a valve member movable between a first position opening the first outlet and closing the second outlet and a second position closing the first outlet and opening the chamber outlet. The valve member is moved to its first position when the engine is off so fuel vapors are collected in the canister and to its second position when the engine is operating so fuel vapors are directed to the air passage.

Abstract: A by-pass valve (1) for use in the exhaust system of an internal combustion engine has an improvement comprising control means (69) responsive to engine vacuum for exposing a chamber (27) to engine vacuum, the control means being responsive to an abrupt change in engine vacuum such as occurs during engine decelerations for spoiling the vacuum in the chamber and causing a vacuum responsive means (19) to close a first valve (15) and open a second valve (17). The control means reestablishes the vacuum in the chamber after a predetermined time interval and causes the vacuum responsive means to open the first valve and close the second valve, the controlled opening and closing of the first and second valves preventing engine backfires.

Abstract: A by-pass valve (1) for use in the exhaust system of an internal combustion engine has an improvement comprising control means (69) responsive to engine vacuum for exposing a chamber (27) to engine vacuum, the control means being responsive to an abrupt change in engine vacuum such as occurs during engine decelerations for spoiling the vacuum in the chamber and causing a vacuum responsive means (19) to close a first valve (15) and open a second valve (17). The control means reestablishes the vacuum in the chamber after a predetermined time interval and causes the vacuum responsive means to open the first valve and close the second valve, the controlled closing and opening of the first and second valves preventing engine backfires. The control means includes second means (117) responsive to engine vacuum for spoiling the vacuum in the chamber so long as engine vacuum exceeds a predetermined level whereby the first valve is kept closed and the second valve is kept open by the first vacuum responsive means.

Abstract: A fuel pump improvement comprises a lip formed around the periphery of the open end of a fuel pump body. The lip is bendable over the outer margin of a diaphragm to form a fluid seal therewith. A second seal is provided between the diaphragm and the lip to seal against any fluid leak which may be created when the fuel pump is subjected to abnormal forces during a crash.

Abstract: An improved by-pass valve (1) for use in an automobile exhaust system (ES) comprises an air inlet (7) connected to an air pump (AP), first and second air outlets (15,23) respectively connected to first and second portions (P1,P2) of a catalytic converter (CC) and a third outlet (33) through which air is dumped to atmosphere. Air is directed from the inlet to the first outlet when engine temperature is less than a predetermined value and from the inlet to the second outlet when engine temperature reaches the predetermined value. A first and normally closed valve (81) is intermediate the air inlet and the first and second outlets and a second and normally open valve (83) is intermediate the air inlet and the third outlet. The first valve is opened and the second valve closed when engine vacuum exceeds a predetermined level so air flows to either the first or second outlet. The second valve is reopened whenever the outlet to which air is directed is blocked so air is dumped to atmosphere.

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 carburetor for an internal combustion engine. A carburetor body has an induction passage for air to be drawn into the engine. A throttle valve is positioned in the induction passage and is movable between an open and a closed position to control the quantity of air drawn into the engine. A staging valve is positioned in the induction passage and is movable between an open and a closed position. The staging valve is closed during engine cranking and is moved to a first open position when the engine starts and toward its fully open position as the engine warms up. The opening movement of the staging valve is limited to a second open position which is less than its fully open position. The limiting of staging valve movement to this second and less than fully open position limits the usable air capacity of the carburetor to less than its maximum capacity.

Abstract: Means (1) for decreasing the rate at which a carburetor choke valve (V) closes when the engine (E) on which the carburetor is installed is shut off. First and second spaced-apart horizontal passages (P1 and P2) respectively extend through the upper and lower ends of a housing (H) in which a bi-metal choke coil (B) is mounted. A third passage (P3) extends vertically through the housing and communicates at each end with one end of the respective first and second passages. The other end of the first and second passages are connected (15,17) to a water circulating passage (WP) in the engine whereby water circulating through the engine flows through the first, second, and third passages and some of the water heat is transmitted to the housing and the bi-metal coil so the coil cools at a slower rate than that at which it otherwise cools.

Abstract: A carburetor for an internal combustion engine. A carburetor body has an induction passage for air to be drawn into the engine. A throttle valve is positioned in the induction passage and is movable between an open and a closed position to control the quantity of air drawn into the engine. A staging valve is positioned in the induction passage and is movable between an open and a closed position. The staging valve is closed during engine cranking and is moved to a first open position when the engine starts and toward its fully open position as the engine warms up. The opening movement of the staging valve is limited to a second open position which is less than its fully open position. The limiting of staging valve movement to this second and less than fully open position limits the usable air capacity of the carburetor to less than its maximum capacity.

Abstract: Altitude compensation apparatus for use with a carburetion system for an internal combustion engine, the system having a passage through which air is drawn into the engine, a throttle valve positioned in the passage and movable between an open and a closed position to control the flow of air therethrough and a fuel circuit through which fuel is delivered to the passage for mixing with air to form an air-fuel mixture combusted in the engine. The position of the throttle valve, the flow rate of air through the passage and the vacuum level in the engine are each sensed and respective electrical signals representative thereof are supplied. The quantity of fuel supplied by the fuel circuit to the passage is metered thereby to maintain the air-fuel ratio of the mixture produced at a preselected value. In response to the aforesaid signals, the density of air being drawn into the engine is calculated and a control signal is generated to control the metering of fuel.

Abstract: A forced air control valve for an air injection system in an internal combustion engine is shifted during cold engine operation to divert air flow to the exhaust manifold upstream of a catalytic converter bed to supply air to the exhaust gases for further combustion prior to entry in the catalytic converter. A diaphragm operated main valve is responsive to a vacuum from the intake manifold for diverting air to the exhaust manifold and a temperature activated vacuum switch shuts off the vacuum when the engine warms up. Upon deceleration during cold engine operation the control valve is shifted to divert air away from the exhaust manifold.

Abstract: A forced air control valve for an air injection system in an internal combustion engine has a diaphragm operated main valve member responsive to the vacuum from intake manifold to divert air from the exhaust system to atmosphere. A separate shifting or diverter valve for the exhaust system is temperature responsive and when the main valve member is open permits the supply of air to the exhaust manifold upstream of a catalytic converter only during cold engine operation. During warm engine operation when the main valve member is open, the separate shifting valve diverts the air to the catalytic converter. Upon deceleration during cold engine operation the separate diverter valve is shifted to divert air from the exhaust manifold to the catalytic converter. A temperature sensitive overheat switch is operable upon overheating of the catalyst to vent the forced air to atmosphere.

Abstract: A carburetor has an induction passage, a fuel circuit and a choke valve positioned at the inlet of the induction passage. A metering rod extends transversely of the induction passage and has a variable diameter end portion projecting into an outlet of the fuel circuit. The metering rod is movable relative to the outlet in response to the choke valve opening and closing to control the quantity of fuel entering the induction passage. An opening force is exerted on the choke valve in response to the vacuum created in the engine, the exertion of this opening force being delayed until after an initial opening force has been exerted on the choke valve. The exertion of the second opening force moves the choke valve from a first position to a second and more fully open position.

Abstract: A staged multi-barrel carburetor (C) has two air induction passages (P) and first and second throttle valves (T1,T2) one of which is positioned in each of the respective induction passages. The first throttle valve (T1) is operable to open prior to the second throttle valve (T2) opening, and a countershaft (CS) is interconnected with the first throttle valve for rotation therewith as it opens and closes. The countershaft is interconnected (1) with the second throttle valve to open it as the first throttle valve opens, but not until the first throttle valve has opened to a predetermined open position (15). Opening movement of the second throttle valve, after the first throttle valve has opened to its predetermined open position, is delayed (21) if engine vacuum exceeds a predetermined level thereby to prevent lags in engine performance which may occur during engine acceleration.

Abstract: A carburetor for an internal combustion engine. A carburetor body has an induction passage for air to be drawn into the engine. A throttle valve is positioned in the induction passage and is movable between an open and a closed position to control the quantity of air drawn into the engine. A staging valve is positioned in the induction passage and is movable between an open and a closed position. The staging valve is closed during engine cranking and is moved to a first open position when the engine starts and toward its fully open position as the engine warms up. The opening movement of the staging valve is limited to a second open position which is less than its fully open position. The limiting of staging valve movement to this second and less than fully open position limits the usable air capacity of the carburetor to less than its maximum capacity.

Abstract: A carburetor for an internal combustion engine has an air passage, a throttle valve movable in the air passage for controlling flow of air therethrough, a source of fuel, and a fuel passage through which fuel is drawn from the source to the air passage for mixing with air to produce an air-fuel mixture combusted in the engine. The fuel passage has an orifice at one end communicating with the fuel source. A metering rod has a diameter variable along its length and is positioned in the orifice in response to movement of the throttle valve thereby to control the quantity of fuel drawn through the fuel passage. The position of the metering rod in the orifice is varied in response to a change in the engine vacuum level when a change in the load on the engine occurs. The movement of the metering rod produced in response to a change in the engine vacuum level is limited thereby to limit the variation in quantity of fuel drawn through the fuel passage when a change in engine vacuum level occurs.

Abstract: Apparatus for venting fuel vapors present in the fuel bowl of a carburetor for an internal combustion engine comprises a bowl vent through which fuel vapors discharge when the vent is open. A valve opens and closes the vent. A biasing force is exerted on the valve to close the vent. In response to starting of the engine first and second opening forces are exerted on the valve; these forces being sufficient to overcome the biasing force exerted thereon and open the vent. Each vent opening force is independently sufficient to open the vent and the vent is open when the engine is running even if one of the first and second forces is not exerted on the valve or is insufficient to open the valve.