Abstract: A carburetor having a first valve to control the application of pressure pulses to a fuel metering assembly of the carburetor through a first flow path and a second valve which controls at least a second flow path to provide an enriched fuel and air mixture to the engine to facilitate starting the engine and warming it up. The pressure pulses are preferably applied to a fuel metering diaphragm to actuate the diaphragm and cause a richer than normal fuel and air mixture to be delivered to the engine. Desirably, a maximum enrichment of the fuel and air mixture is obtained when at least one valve is open to facilitate starting the engine, and a lesser enrichment of the mixture may be obtained by closing a valve to facilitate warming the engine up after it is initially started.

Abstract: A carburetor has an upper body and a lower separate nozzle post member that extends into the fuel chamber of a lower fuel bowl. The nozzle post member has a main nozzle mixing passage leading from a main fuel jet inlet to a nozzle. An annular air passage and an annular idle fuel passage surround the mixing passage. The nozzle post member also has integrally formed brackets to pivotally mount the fuel float.

Abstract: A carburetor having a fuel pump, a fuel metering diaphragm defining a fuel chamber on one side of the diaphragm and an air chamber on the opposite side of the diaphragm vented to the atmosphere, and a second diaphragm defining a first chamber on one side of the second diaphragm in communication with the carburetor fuel pump and a valve actuated by the second diaphragm to control the application of engine crankcase pressure pulses to the fuel metering diaphragm in response to the pressure at the carburetor fuel pump. The second diaphragm is yieldably biased to position the valve in a first position and upon cranking for initially starting the engine, pressure pulses from the engine crankcase are communicated to the air chamber of the fuel metering diaphragm. The pressure pulses from the engine crankcase act on the fuel metering diaphragm causing it to fluctuate and thereby increase the quantity of fuel mixed with the air flowing through the carburetor to facilitate staring the engine.

Abstract: An improved fuel delivery system, method and apparatus providing a hybrid carburetor and direct fuel injection system, utilizing the best of each for different engine operational modes to thereby meet emission requirements for small hand-held two-cycle engines using standard two-stroke gasoline and oil premix fuel. A diaphragm carburetor and associated diaphragm fuel pump operates alone to supply a proper A/F idle mixture sufficient only for engine power at start-up idle and off idle (light load). This engine aspiration carburetor fuel delivery system is operated continuously, and then at part (off idle-light load) and wide open throttle (W.O.T) the same is combined with operation of a direct cylinder fuel injection system, using a second stage pressure boost peristaltic type pump and fuel injector nozzle, that is engine self-regulated and driven to operate only at part-throttle and W.O.T. to thereby supply most of the engine fuel demand in these operational ranges.

Abstract: A flow control valve for an internal combustion engine fuel delivery system that includes a valve body having a fuel inlet for connection to a fuel supply and a fuel outlet for connection to the fuel pump, so that the pump can draw fuel under vacuum from the supply through the valve and deliver fuel to an engine. A valve element is disposed within the valve body between the inlet and the outlet, and springs urge the valve element to a closed position within the valve body. A diaphragm is also disposed within the valve body between the valve element and the fuel outlet, and is coupled to the valve element such that suction vacuum applied by a fuel pump to the valve body outlet operates the diaphragm to open the valve element against forces applied by the valve springs to permit flow of fuel from the supply through the valve to the pump.

Abstract: Method, system and apparatus for metering fuel to an internal combustion engine via a carburetor having a mixture conduit with a venturi therein. A main fuel nozzle supplies fuel to the venturi of the carburetor in response to the static pressure drop induced across an associated main fuel flow controlling restriction by the engine intake induced air flow through the carburetor mixture conduit. A pitot tube is disposed in the venturi with an opening facing upstream in a zone of maximum air flow through the carburetor venturi. A vent passageway system connects the pitot tube to a single closed air chamber cooperable with either a diaphragm or a float to regulate operation of an inlet valve controlling flow of fuel to a main fuel controlling restriction.

Abstract: A temperature compensated carburetor having a fuel metering system including a variable restriction needle gate valve for varying the effective flow cross-sectional area of the main and/or idle fuel supply duct to modulate the flow rate of fuel to the carburetor venturi mixing passage. The needle gate valve is made of plastic material having a much greater coefficient of expansion than the aluminum carburetor body in which it is adjustably mounted such that differential linear expansion and contraction of the needle valve relative to the carburetor body in response to ambient temperature changes varies the flow-controlling cross-sectional area of the fuel duct inversely relative to ambient temperature changes. The needle valve is a rod-like body with a threaded cylindrical mounting portion at one end threadably secured in a threaded bore in the carburetor body.

Abstract: The disclosure embraces a fuel control system and apparatus for delivering or supplying liquid fuel to a gas turbine engine comprising a body construction (12) in which is contained a first diaphragm-actuated fuel control valve arrangement (40) for regulating fuel flow to the turbine engine for normal engine operation, a second diaphragm-actuated fuel control valve arrangement (42) for regulating fuel flow to the turbine engine for engine idling operation, the diaphragm-atuated valve arrangements (40) and (42) being responsive to the difference between the engine burner pressure and the compressor discharge pressure. A third diaphragm-actuated fuel control valve arrangement (44) is provided for supplying fuel to the turbine engine for engine starting purposes.

Abstract: The disclosure embraces a charge forming apparatus or carburetor and method of operation thereof wherein the charge forming apparatus is of modular construction comprising a body construction and a fluid flow control system including a laminar means or member having perforate fuel conveying regions including a channel for conveying fuel from a fuel chamber to an engine idling and low speed orifice system in association with a passage arranged to receive pressure pulses from the engine crankcase under open throttle conditions for discharging fuel in the channel through an aperture means independent of the main and engine idling fuel delivery aperture means into the air induction system of the charge forming apparatus for engine acceleration purposes, the fuel conveying channel being of substantial length and of a cross sectional area to effect delayed fuel flow to the engine idling system to avoid formation of an overrich mixture which would result in stalling the engine.