Abstract: A dual fuel supply system for an automotive engine has a fuel tank adapted to contain both methane and propane at pressures up to 17,000 kPa. A switching valve assembly directs methane to the engine fuel metering apparatus when the fuel tank pressure exceeds 1400 kPa and directs propane to the engine fuel metering apparatus when the fuel tank pressure is less than 1400 kPa.

Abstract: A diesel engine is designed to burn on a mixture of liquid fuel or diesel, and liquefied petroleum gas, or gas. The diesel is injected into the cylinders as is conventional on diesel engines. The gas is mixed into the intake air. The output of the governor connects to a diesel control and a gas control. As more fuel is consumed, both the amount of diesel and the amount of gas is increased; however, the amount of gas is increased at a much faster rate than the amount of diesel is increased. At no load, the engine operates on about 76 percent diesel and 24 percent gas. At 100 percent load, the engine operates on about 80 percent gas and 20 percent diesel. A special gas valve is used.

Abstract: Disclosed herein is a gaseous fuel and air supply system for an internal combustion engine, which system comprises an air-fuel mixing chamber, an air supply duct communicating with the mixing chamber and with the atmosphere and including a sensing tap, a flow control valve adapted to communicate with a source of pressurized gas, being operable between open and closed positions, and being biased toward the closed position, a fuel supply duct extending between the flow control valve and the mixing chamber and including a sensing tap, and an actuator communicating with the sensing tap in the air supply duct and with the sensing tap in the fuel supply duct for controlling operation of the flow control valve between the open and closed positions.

Abstract: A gaseous fuel delivery system for a gasoline engine having means for gaseous fuel delivery comprising idle fuel delivery means and acceleration fuel delivery means. Electrically operable means responsive to ported vacuum in the carburetor throat controls operation of the idle fuel delivery means. Electrically operable means responsive to intake manifold vacuum controls operation of the acceleration fuel delivery means. An idle switch responsive to idle position of the throttle prevents opening of the idle fuel delivery means except when the throttle is in the idle position.The engine carburetor is arranged such that no gasoline is delivered for idle operation. Idle needle valves are closed, or eliminated. Transition slots are sized to be operational only as the throttle moves from the idle position and supply no fuel when the throttle is at idle.

Abstract: A gaseous fuel delivery system for a gasoline engine having a gaseous fuel delivery valve means comprising an idle fuel delivery valve and an acceleration fuel delivery valve. Means responsive to air flow through the carburetor throat controls operation of the idle fuel delivery valve. Means responsive to intake manifold vacuum controls operation of the acceleration fuel delivery valve. Electrically operable alternately open idle and acceleration solenoid valves are interposed in separate delivery conduits from the idle and acceleration fuel delivery valves. Means responsive to the opening of the acceleration fuel delivery valve opens the acceleration solenoid valve and closes the idle solenoid valve, reversing the respective valve positions on closing of the acceleration fuel delivery valve. An idle switch responsive to idle position of the throttle prevents opening of the idle solenoid valve except when the throttle is in the idle position.

Abstract: In a gaseous fuel carburetion system in which air and gaseous fuel are mixed in a mixer prior to induction into an internal combustion engine, and in which the rate of flow of the induction air is controlled by throttling the intake of the air/fuel mixture, and in which gaseous fuel is supplied to the system from a pressurized source, an improved method and apparatus for regulating the supply of gaseous fuel to the air/fuel mixer is provided. The method comprises the steps of; sensing at least one operating parameter of the engine which is a function of the induction air flow rate and generating a control signal which varies in response to changes in the induction air flow rate, controlling the rate of flow of the gaseous fuel from the source to the mixer by means of said control signal whereby the rate of flow of the gaseous fuel varies in response to the sensed changes in the parameters related to the air flow rate.

Abstract: An automobile spark plug having fluid flow passages therein for injecting a fuel mixture into the combustion chamber of an internal combustion engine. The spark plug has a central electrode with an ignitor tip at one end thereof and surrounded by concentric fluid flow passages. Liquid atomizing orifice means interconnect the passages and the mixture therefrom flows into a passage surrounding the ignitor tip of the electrode. A gas and liquid mixture (preferably hydrogen with water) are proportioned in response to the quantity of one of the two dispensed.

Abstract: Fuel apparatus including a fuel vaporizing portion, an air conveying portion, a heating portion and a flow control portion; the fuel vaporizing portion including an enclosed chamber, the chamber including a liquid reservoir section and a vapor expansion section, the vapor expansion section including a plurality of baffles providing a tortuous path through the expansion section, a liquid fuel inlet to the chamber and a vapor outlet from the chamber, a first vapor conduit connecting the chamber outlet with a carburetor of an engine, a second vapor conduit connecting the engine carburetor with the chamber adjacent the vapor expansion section thereof; the air conveying portion including an air intake section, a divider for air flowing through the air intake section, a first duct for conveying one part of the air flow to a point adjacent the liquid reservoir section of the enclosed chamber, a second duct for conveying a second part of the air flow to the first vapor conduit; the heating portion being disposed adja

Abstract: A supplementary fuel system adds propane to the induction passage of an ethanol fueled engine to start and sustain operation of the engine at low temperatures. The propane flow is cycled on and off during cranking of the engine and the propane delivery pressure is varied with induction passage pressure.

Abstract: A liquid and supplemental gas fuel supply system for an I.C. engine, and in particular a diesel cycle engine, includes a gas fuel control valve that meters supplemental gas fuel into the engine intake air stream in response to engine air flow using a direct air flow responsive member to control a gas valve through a lost motion connection. The position of the gas valve is moreover controllable by a separate throttle position responsive control system that moves the gas valve towards closed position as the throttle approaches the closed or idle position, and holds the gas valve closed until the throttle has moved away from the closed or idle position. The separate control motion of the gas valve is independent from the motion of the air flow responsive member and does not restrict or interfere with the movement of the latter.

Abstract: A vaporizer for a liquefied petroleum gas engine with a cooling system employing coolant, includes a housing having first, second, and third chambers. The housing has a fuel inlet port which is connected to a lower portion of the first chamber to supply the latter with liquid fuel.An upper portion of the first chamber communicates with the second chamber to supply the latter with fuel. The cross-sectional area of the fuel inlet port is smaller than that of the first chamber so that the speeed of fuel flow through the first chamber will be lower than that of fuel flow through the fuel inlet port. The second chamber is in turn connected to the engine to supply the latter with fuel. A valve controls the communication between the first and second chambers to regulate pressure in the second chamber to such a level that liquid fuel will vaporize. The third chamber is connected to the cooling system to be supplied with the coolant.

Abstract: A fuel system of the gaseous type utilizing the gas such as propane, methane or the like, wherein gas, preferably in liquefied form, in a tank carried in the trunk compartment of a car, for example, is taken from the tank in gaseous form and conveyed to the intake manifold of the internal combustion engine of the car at very low pressure, through a feeder gasket installed between the carburetor and the intake manifold. Thus it does not require modification of the existing carburetor or replacement thereof, and when installed for alternate use with an existing conventional type gasoline fuel system, means are employed for selectively switching from one system to the other.

Abstract: A gaseous fuel-air mixture device for an internal combustion engine having an intake for a fuel-air mixture. A chamber for mixing gaseous fuel and air is provided above the intake. The gaseous fuel is uniformly injected into the mixture chamber from an aperture in the chamber wall. The quantity of air mixed with the gaseous fuel in the mixture chamber is controlled by adjusting the height of a control plate disposed above the chamber.

Abstract: Fuel apparatus including a housing portion, a fuel treating portion, a fuel metering portion and a flow control portion; the housing portion including a main chamber, an upper expansion chamber and first and second lower expansion chambers, the main chamber including an inlet connectable to an exhaust gas source of an internal combustion engine, an outlet for venting the exhaust gas to the atmosphere; the fuel treating portion including first and second conduit coils disposed within the main chamber, each of the conduit coils including an inlet and an outlet, the inlet of the first coil communicating with the first lower expansion chamber and the outlet of the first coil communicating with the second lower expansion chamber, the inlet of the second coil communicating with the second lower expansion chamber and the outlet of the second coil communicating with the upper expansion chamber, inlet mechanism for delivering liquid fuel into the first lower expansion chamber, the inlet mechanism including a vacuum so

Abstract: A liquid fuel injection system for an internal combustion engine in which the fuel, gaseous under ambient conditions, is injected in liquid form under compression into the intake manifold of the engine. Fuel is controlled largely by intake manifold pressure together with the RPM of the engine. Some fuel bypasses the injector, is vaporized and fed into the intake manifold through a sleeve in sufficient amounts to maintain the engine at idle and low load conditions and prevent the injector from freezing.

Abstract: A control system is provided for regulating the fuel feed to a dual fuel internal combustion engine. The engine includes a source of first fuel, a pump therefor, and a source of second fuel under a predetermined pressure. A first valve is mounted within a first feed line connecting the engine to the pump outlet. A second valve is mounted within a second feed line connecting the engine to the pump outlet. A third valve is mounted within a third feed line connecting the engine to the second fuel source. A pressure-sensitive metering valve is disposed within the third feed line downstream of the third valve. A means is provided which transmits the flow pressure from the second valve to the metering valve and thus, determines the setting of the latter. A control means, adjustable between two modes, is operatively connected to the first, second, and third valves.

Abstract: A system for an existing combustion engine is provided for enabling the engine to be operated on liquefied propane, alone, through a conventional gasoline carburetor, to operate on either gasoline or liquefied propane through a conventional gasoline carburetor, to operate on liquefied propane, alone, through an inlet casting to be utilized in lieu of a conventional gasoline carburetor, or to operate on liquefied propane, alone, at a substantially constant engine speed. Further, the system is also operative in conjunction with a diesel engine whereby a small amount of gasified liquid propane may be introduced into the induction system of a diesel engine as a supplemental fuel charge therefor during high power demand periods of operation.

Abstract: An externally ignited internal combustion engine, operable by a homogeneous fuel, wherein liquid fuel is completely vaporized and at an approximately relatively lean proportion is mixed with air to provide for quantity control of the fuel-air mixture. The quantity control remains limited to a lower part throttle or partial load range and above such range, fuel in a liquid condition is injected into the combustion chamber of the internal combustion engine to enable a quality control over the fuel mixture. The injection of the fuel is carried out so that the injected jet of fuel does not contact the relatively cold wall parts of combustion chambers of the respective cylinders of the internal combustion engine.

Abstract: A fuel injection system for an Otto engine having a mixture-control unit provided with an air flow sensor and a fuel distributor. The fuel injection system may be switched from service with a gasoline-operated engine to service with a gas-operated engine and, in the process, the sensor plate of the air flow sensor is opened as well as blocked in the open position with a gas-operated engine.

Abstract: A spare tank system for a motor vehicle is provided which may conveniently be coupled into the normal fuel line of the vehicle, and which comprises a conduit in which a valve and a fitting are mounted. During normal operation of the motor vehicle, the valve is in a first operating position, and the fuel from the normal fuel system flows through the fuel line and through the conduit to the engine without being impeded in any way. One or more closed cylinders, or other pressurized containers of fuel, such as gasoline, are also provided which may normally be carried in the trunk of the vehicle. Should the vehicle run out of gas, the valve is set to a second operating position, and the nozzle of the container is inserted into the fitting, so that fuel from the container may now flow through the conduit to the engine, with the normal fuel system being shut off.

Abstract: Disclosed herein is a spark advance control mechanism for an engine capable of being selectively operated on gaseous fuel and on liquid fuel.

Abstract: A multi-fuel gasifier system for internal combustion engines comprising a hollow casing having heat conducting plates therein in thermal contact with a heat exchange duct passing through the casing through which hot exhaust gas passes from the exhaust manifold to the exhaust pipe, a gasifying chamber substantially centrally located within the casing and surrounded by the heat conducting plates and defined by inner wall portions of the plates. An inlet in the casing wall communicates with one end of the chamber and the outlet of the carburetor. An outlet through the casing wall communicates with the other end of the chamber and the intake manifold of the engine. Adjacent the inlet end of the chamber is a first perforated vaporization cap through which fuel-air mixture from the carburetor passes and thereafter contacts a second conically shaped vaporization cap which deflects and sprays the fuel mixture into the vaporization chamber.

Abstract: The device for proportioning a gaseous fuel and air for combustion in an internal combustion engine includes a plate-like first member having a peripheral edge portion and a second member cooperating with the first member to define a mixing chamber having an outlet adapted to be connected in communication with the air intake of the engine carburetor. The second member also includes an annular portion having an arcuate first wall which is convex to and spaced from the peripheral edge portion of the first member to define an annular venturi having an inlet in communication with the atmosphere and an annular outlet in communication with the mixing chamber. A base member or second wall cooperates with the arcuate wall to form a substantially closed, annular plenum chamber into which a gaseous fuel, such as natural gas, is admitted when the engine is to be operated on the gaseous fuel.

Abstract: Disclosed herein is an apparatus which is adapted for controlling operation of an internal combustion engine which is selectively operable using gaseous fuel or liquid fuel, and which comprises a gaseous fuel supply line extending between the engine and a source of gaseous fuel, a liquid fuel supply line extending between the engine and a source of liquid fuel, and a control for controlling supply to the engine of the gaseous fuel and the liquid fuel, which control includes an operator controlled fuel selector switch movable between a gaseous fuel position and a liquid fuel position, which control is operable following prior engine operation with gaseous fuel and in response to movement of the fuel selector switch from the gaseous fuel position to the liquid fuel position for permitting liquid fuel flow through the liquid fuel supply line, for permitting continued gaseous fuel flow through the gaseous fuel supply line until initiation of liquid fuel combustion, and thereafter preventing further gaseous fuel f

Abstract: An attachment within the air cleaner housing of a liquid-fuel internal-combustion engine, the attachment having a circumferential venturi air passage and a gaseous fuel inlet slot inboard of the narrowest portion of the venturi air passage.

Abstract: Apparatus for enabling an engine to burn either liquid fuel or gaseous fuel, and which includes a gaseous fuel control valve for location in a gaseous fuel supply line between a gaseous fuel storage container and an intake manifold of the engine. The control valve includes a single diaphragm which defines one wall of a chamber having a gas inlet and a gas outlet. An accelerator pedal controlled outlet valve obturator is positioned in the outlet, for controlling the intensity of suction applied to the chamber in response to the position of the accelerator pedal. An inlet valve obturator is provided to control the flow of gaseous fuel through the inlet into the chamber. The inlet valve obturator is connected to the diaphragm so that movement of the diaphragm controls of the inlet valve obturator.

Abstract: An attachment for operating an internal combustion engine on either gaseous or liquid fuel incorporates a modified air cleaner assembly having a cover and an annular adapter between which is sandwiched a typical annular filter element, the adapter fitting over the engine air intake. A diaphragm movably mounts a circular diaphragm plate to the cover to form a chamber therewith on one side of the diaphragm plate and an annular venturi between the other side of the diaphragm plate and the adapter. In one version gaseous fuel is admitted into the chamber through an inlet fitting secured to the cover and thence through ports in the diaphragm plate into the venturi. In another version the gaseous fuel is admitted through an inlet fitting secured to the adapter and thence into the venturi through ports in the adapter, a hose connecting the inlet fitting and the chamber.

Abstract: A method and apparatus for utilizing both a liquid fuel and a gaseous fuel with a minimum change in a standard internal combustion engine. The gaseous and liquid fuels are fed from separate fuel supplies with the flow of fuels being controlled in response to engine load so that at engine idle only gaseous fuel is supplied and combusted by the engine and both gaseous and liquid fuels are supplied and combusted when the engine is operating under load conditions.

Abstract: An arrangement for switching a carburetor in an internal combustion engine in a vehicle adapted for alternative operation on liquid or gaseous fuel. The carburetor is of the type where the pressure upstream of a throttle butterfly determines the engine air and fuel supply by the actuation of a piston provided with a metering needle. When using liquid fuel, the piston executes upward and downward movements, a passage leading through the carburetor thereby being constricted to a varying degree, and similarly the needle is caused to be thrust to a varying degree into a nozzle for metering liquid fuel to the engine induction air. This signifies too rapid wear of the metering needle in alternating operation on liquid and gaseous fuel.

Abstract: A propane gas feed device and system are provided wherein controlled, measured quantities of propane gas are controllably pre-mixed with air and this pre-mixture of air-propane is fed as a carburetor mixture for combustion in the engine. An air cut-off screen is controllably operated to adjust the air-fuel ratio relative to a changeover in the propane and gasoline demands. The propane feed system may be retro-fitted to an automobile employing conventional propane feed and provides for more efficient use of the propane with reduced unburned fraction in the engine exhaust. The propane air-feed device is also useful as wherein propane is the sole fuel.

Abstract: A system which can be retrofit into an existing conventional gasoline powered vehicle for enabling the vehicle to operate on either gasoline or liquefied propane fuel. The system includes a mixer in the form of an adapter to fit on the top of an existing carburetor. The mixer has a unique spring balanced metering device which controls flow of gaseous propane to the carburetor in proportion to airflow through the carburetor. The mixer is connected to a regulator assembly which receives liquid propane in a first chamber, heats the liquid propane to form a vapor, and feeds the vapor through an idle valve to control idling of the engine. The vapor is also passed to a second chamber of the regulator assembly in response to demand from the metering device which is sensed by a diaphragm actuated gas flow valve. From the second chamber, the gaseous propane is fed to a high speed inlet of the mixer.

Abstract: A fuel vaporizing device for use with internal combustion engines including a carburetor, an air filter, and a fuel tank. In the device of the present invention fuel consumed by the engine is directed to source such as a fuel tank to a conventional carburetor with the fuel aspirated and mixed with engine air and burned in a conventional manner. Fuel in the second fuel conduit is directed to a fuel vaporizer where the fuel is heated to enhance vaporization. An air pump directs air to the fuel vaporizer where the air collects vapor, and the air and vapor are directed to the carburetor upstream of the carburetor throttle valve where the air and vapor are mixed with the air passing through the carburetor.

Abstract: An internal combustion engine has a carburetor, with a throttle valve and a choke valve, that delivers a fuel-air mixture to the intake manifold. An auxiliary system uses a blending chamber which feeds the manifold exclusive of the engine carburetor and through a metering valve that responds to engine vacuum level for controlling the amount of blend drawn through the blending chamber. At the inlet of the blending chamber is an atomizing throat fed with fuel and air. The drawing of the blend from the outlet of the chamber draws air through the throat and into comminglement with liquid fuel which is atomized by action of the throat. Under normal operating conditions and adjustment, the auxiliary system improves engine performance by increasing fuel economy and reducing engine exhaust pollution.

Abstract: A carburetor includes means for detecting the volume of a first fuel such as gasoline within a float chamber, and valve means for preventing a second fuel such as LPG from being fed into an induction passage leading to an engine when the volume of the first fuel within the float chamber is above a predetermined value. The second fuel is prevented from being fed into the induction passage until the volume of the first fuel within the float chamber is decreased to a small amount or zero. Thus, the air-fuel mixture within the induction passage is not enriched too much after the fuel supply is changed from the first fuel to the second fuel.

Abstract: In a vehicle comprising a liquid-cooled gasoline fueled internal combustion engine a supplemental adapter apparatus comprising tanks, valves and conduits is incorporated into the cooling system and fuel system of that internal combustion engine with some modification of the fuel feeding and the cooling systems of that engine and continually utilizes the normally unused heat of the liquid coolant of such engine to fractionate liquid fuel mixtures fed to that engine with continual intermittent use of resulting separate fractions thereby formed to improve the efficiency of conversion of the potential energy of such liquid fuel to mechanical energy.

Abstract: A fuel supply system for an internal combustion engine operated on gaseous fuels, for example, liquid petroleum gas (LPG). The system includes a housing having a chamber for vaporizing liquid gas, including means for heating the vaporizing chamber. Also included in the housing is a mixing chamber for mixing the vaporized gas with incoming air for delivery to the intake manifold of an internal combustion engine through a standard carburetor. The fuel supply system includes means for mounting the system on the carburetor, including means for supporting an air filter circumjacent the mixing chamber.

Abstract: A fuel heating apparatus for carburetor-equipped vehicles which includes a vaporizer box provided with a fuel level control for maintaining a level of fuel therein, and having an air inlet and a fuel-air mixture outlet, and further fitted with a cold fuel inlet line and a cold fuel discharge line, a hot fuel inlet line and a heat exchanger for heating fuel recycled from the vaporizer box and subsequently recharged into the box, the apparatus further including a mixing chamber for receiving the fuel-air mixture discharged from the vaporizer box and more completely mixing the fuel and air prior to introducing the charge into the carburetor. The fuel heating apparatus is designed to improve the fuel efficiency of carburetor-equipped vehicle engines and to extend fuel mileage capabilities of the vehicles. The system can be quickly and easily adapted to substantially any carburetor-equipped vehicle currently on the market, and is particularly well suited to gasoline engine systems.

Abstract: A method and apparatus for efficiently atomizing fuel for supplemental supply to an internal combustion engine are described wherein the atomized fuel is supplied to the engine in addition to the conventionally carburetted fuel. A portion of the fuel being supplied to a carburetor in a conventional manner is diverted to the system according to the invention and is supplied thereto in a metered fashion. A fuel vapor is produced and is supplied to the engine downstream of the carburetor, as required by the engine; this requirement being indicated by engine vacuum. Vaporization is accomplished in the described embodiment by heat and ultrasonic nebulization.

Abstract: An internal combustion engine dual fuel system for controllably running the internal combustion engine on a liquid fuel, such as gasoline, in the usual manner or, at will, on liquified petroleum (LP) gaseous fuel. The conventional liquid fuel system of the internal combustion engine is unmodified except for the addition of a remotely controlled shut-off valve in the fuel line at the carburetor fuel inlet. An LP gas suction verturi is disposed in the air induction flow to the carburetor inlet, for example by being mounted in the air filter above the carburetor inlet, and is supplied in fuel from the vapor phase of an LP gas, such as butane or propane, above the level of the liquified gas in an appropriate tank. The LP gas tank and the line supplying the gas to the carburetor air inlet are maintained at a substantially constant temperature via a by-pass of the engine coolant circuit, the flow of coolant through the by-pass being automatically controlled by a thermostat.

Abstract: A slow-run system for gaseous fueled internal combustion engines, including gaseous fuel conversions of liquid fuel engines for alternate operation on either fuel, employs a valve having an inlet receiving gaseous fuel from between the primary regulator and zero pressure governor and an outlet emptying into the air cleaner assembly upstream of the liquid fuel carburetor or equivalent means. The valve is actuated through a connection into the engine air intake manifold or similar passage below the throttle such that the valve opens to supply gaseous fuel to the air cleaner assembly during slow-run when manifold vacuum is high and remains open throughout substantially all of the engine's operating range.

Abstract: A modified internal combustion engine of the carburetor type and method of modification enables low and medium BTU fuels in gaseous form to be utilized either as the sole fuel or in conjunction with other relatively high BTU fuels in liquid or gaseous form.

Abstract: A fuel system for supplying gasoline or like vaporizable fuel to the carburetor of an internal combustion engine as a mixture of liquid and vapor wherein the vapor predominates.

Abstract: A gas carburettor suitable for mounting on a petrol carburettor of a combustion engine and intended for mixing a gas with air and for supplying the mixture of air and gas to the combustion engine. The gas carburettor comprises a housing having a centrally arranged passage bounded by a wall of the housing. The wall bounding the passage has an opening therethrough for supplying gas to the passage. A member is disposed in the passage such that an annular airway is defined between the housing and the member.

Abstract: An auxiliary fuel metering and transfer control system for an internal combustion engine. The system consists essentially of a pressure vessel for storage of propane, methane, natural gas or a similar gaseous fuel, a pressure regulator for maintaining constant gaseous fuel pressure during operation of the system, a solenoid valve and a magnetic reset safety switch, a metering valve, a transfer valve and an auxiliary fuel nozzle positioned in the Venturi of the carburetor on the engine using the system. The metering valve operates in response to changes in the intake manifold vacuum of the engine and changes in the air velocity in the carburetor of the engine. The transfer valve operates in response to movement of the throttle linkage on the carburetor of the engine. During operation of the engine, the system is substituted for both the idle circuit or system and the acceleration circuit or system of the carburetor.