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US 6,269,799 B1Granted
Outboard motor fuel supply system
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsHitoshi Watanabe, Masaki Okazaki, Takahide Watanabe
Life of this patent
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AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsHitoshi Watanabe, Masaki Okazaki, Takahide Watanabe
Estimating the term…
A fuel supply system for use with an engine having four vertically-arranged cylinders and multiple charge formers prevents air or vapor pockets from accumulating within the fuel pump or fuel lines. A pair of fuel pumps are mounted vertically one above the other. A fuel inlet port of each pump is formed at the lower-most portion of the pump. A fuel discharge port is formed at the upper-most portion of each port. A conduit attached to the top fuel pump's discharge port supplies fuel to an uppermost and lowermost carburetor. A conduit from the lowermost fuel pump supplies fuel to the middle two carburetors. The uppermost carburetor's fuel inlet port is positioned vertically higher than the top fuel pump's discharge port. The second carburetor's fuel inlet port is positioned vertically higher than the second fuel pump's discharge port. Air or vapor pockets within the fuel lines naturally migrates through the fuel pump and through the fuel conduits into the carburetors without becoming trapped in the fuel supply system.
An internal combustion engine having a plurality of variable volume combustion chambers having horizontal axes and oriented so that their axes are arranged above one another, each of the combustion chambers being defined by at least a pair of components that move relative to each other, a plurality of charge formers, each charge former communicating with a corresponding combustion chamber to supply a fuel/air charge to the respective combustion chamber, the charge formers arranged vertically relative to each other, and a fuel supply system connected to the charge formers to deliver fuel to the charge formers, the fuel supply system including a fuel pump having a discharge port communicating through a conduit system with the charge formers, the discharge port being positioned at an uppermost portion of the fuel pump so that the vapor within the pump will migrate toward and through the discharge port into the conduit system, and a discharge check valve positioned adjacent the discharge port, the discharge port being positioned below a fuel inlet port of the uppermost charge former, the conduit system defining a generally upwardly-directed path from the discharge port to the uppermost charge former fuel inlet port, the conduit system adapted so that, at any point within the conduit system, a generally upwardly directed path toward a fuel inlet port of one of the charge formers is defined within the conduit system so that vapors can be smoothly and easily vented from the conduit system to the charge formers.
An internal combustion engine having at least two variable volume combustion chambers, the combustion chambers having horizontal axes that are arranged above one another, each of the combustion chambers being defined by at least a pair of components that move relative to each other, a plurality of charge formers for supplying fuel/air charges to corresponding combustion chambers, the charge formers also arranged above one another, and a fuel supply system for supplying fuel to the charge formers, the fuel supply system including a fuel pump having a discharge port communicating through a conduit system with the charge formers, the conduit system including means for evacuating vapor which may be in the conduit system so that vapor at any location within the conduit system travels along a path within the conduit system to a charge former for venting from the system without reentering the fuel pump.
An internal combustion engine having at least three variable volume combustion chambers having horizontal axes and being oriented so that their axes are arranged above one another, each of the combustion chambers being defined by at least a pair of components that move relative to each other, at least three charge formers also arranged above one another, each charge former communicating with a corresponding combustion chamber to supply a fuel/air charge to the combustion chamber, and a fuel supply system connected to the charge formers to deliver fuel to the charge formers, the fuel supply system including a first fuel pump having a discharge port communicating through a conduit with at least two of the charge formers, the discharge port being positioned at an uppermost portion of the fuel pump and being vertically lower than a fuel inlet port of an uppermost charge former and vertically above a fuel inlet port of a lower charge former, and a second fuel pump oriented vertically below the first fuel pump, the second fuel pump having a second discharge port positioned at an uppermost portion of the second fuel pump, the second discharge port being positioned vertically below a fuel inlet port of a middle charge former, the middle inlet port being vertically above the lower inlet port.
Dependencies are inferred from the claim text.