The second communication passageway is disposed to sequentially register with the suction ports as the plunger rotates for communicating the suction space with each of the suction ports that registers with the second communication passageway a solenoid valve disposed to selectively open and close the first communication passageway a selector valve operable to assume, independently of the opening and closing action of the solenoid valve, a first valve position wherein the first communication passageway is closed and simultaneously the second communication passageway is opened, at the start of the engine, and a second valve position wherein the second communication passageway is closed and simultaneously the first communication passageway is is opened, during operation of the engine other than at the start of the engine and control means operable in response to operating conditions of the engine to control the solenoid valve to alternately open and close so as to achieve required fuel injection quantity and required injection timing. The suction ports with the pump working chamber a first communication passageway communicating the suction space with the pump working chamber a second communication passageway having a restriction therein. « lessĪ distributor type fuel injection pump is described for an internal combustion engine, comprising: a suction space filled with fuel under pressure variable as a function of the rotational speed of the engine a plunger driven by the engine for concurrent reciprocating and rotative motion to effect suction of fuel from the suction space into a pump working chamber defined by the plunger at one end thereof, pressure delivery of fuel from the pump working chamber and distribution of the fuel into cylinders of the engine suction ports formed in the plunger and identical in number with the cylinders of more » the engine.
A primer pump having an inlet connected in communication with the priming fuel port can be operated to selectively introduce a quantity of the secondary fuel into the induction passage to facilitate engine starting. In one embodiment, the carburetor includes a throttle valve located downstream of the low pressure zone and a priming fuel port located downstream of the throttle valve. The second or secondary fuel supply includes a second float bowl communicable with the carburetor cavity and connected to a source of a second or secondary fuel, such as gasoline, and a second float controlled valve operable to control the supply of the secondary fuel to the second float bowl. A first or primary fuel supply includes a first float bowl connected to a source of a primary fuel, such as kerosene, a first float controlled valve operable to control the supply of the primary fuel to the first float bowl, a fuel nozzle for supplying the primary fuel from the first float bowl to the more » low pressure zone, and a conduit connecting the first float bowl in communication with the carburetor cavity. The dual fuel supply system for an internal combustion engine has a carburetor including a fuel/air induction passage having means defining a low pressure zone and a secondary orifice and further including a cavity communicating with the fuel induction passage through the secondary orifice.
= ,Ī carburetion system is described for an internal combustion engine comprising: a diaphragm carburetor comprising a carburetor body, an air-fuel passage in the carburetor body adapted to communicate with an engine combustion chamber, a fuel metering chamber in the carburetor body in communication with the air-fuel passage and a fuel pump including a fuel chamber in the carburetor body, the metering chamber communicating with the fuel pump chamber and the air-fuel passage a manually actuatable primer pump means comprising a variable volume chamber a fuel pump outlet check valve having an inlet side connected to the fuel pump and an more » outlet side connected to the primer pump chamber a priming passageway in the carburetor body connected to the air-fuel passage a primer check valve having an inlet connected to the primer pump means chamber and an outlet connected to the priming passageway and an inlet passageway in the carburetor body communicating between the outlet side of the fuel pump outlet check valve and the metering chamber.
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