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US 6,279,546 B1Granted
Watercraft fuel supply system
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsRyoichi Nakase, Naoki Katoh, Shigeyuki Ozawa, Masayoshi Nanami
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AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsRyoichi Nakase, Naoki Katoh, Shigeyuki Ozawa, Masayoshi Nanami
Estimating the term…
An improved fuel delivery and injection system for a small watercraft engine reduces the heat effects within an enclosed engine compartment upon a fuel pump of and the fuel within a fuel injection system. The fuel delivery system includes a vapor separator and a high-pressure fuel pump. The fuel pump is at least partially located within the vapor separator. The fuel within the vapor separator cools the fuel pump. The vapor separator also is positioned between a pair of air ducts such that an air stream between the ducts cools the fuel within the vapor separator. This arrangement consequently improves the consistency of the air/fuel ratio in the fuel charges delivered to the engine cylinders, provides a compact structure between the fuel pump, and the vapor separator and improves the durability of the fuel pump.
A small watercraft comprising a longitudinally extending straddle-type seat and a steering operator positioned near a front section of the seat, a hull including an engine compartment, an internal combustion engine being positioned within the engine compartment and powering a propulsion device of the watercraft, the steering operator being coupled to the propulsion device, and a fuel supply system including a vapor separator, a fuel pump, at least one charge former, the fuel pump arranged to draw fuel from the vapor separator and to supply fuel to the at least one charge former of the engine through a fuel supply line, wherein the hull includes at least two air openings, the vapor separator being positioned between the air openings.
A personal watercraft comprising a hull defining a longitudinal axis and including an engine compartment, an internal combustion engine being positioned within the engine compartment and powering a propulsion device of the watercraft, a fuel supply system including a vapor separator and at least one charge former, the fuel supply system being configured to supply fuel from the vapor separator to the at least one charge former of the engine through a fuel supply line, an exhaust system configured to guide exhaust gases from the engine body to an exhaust discharge and including at least a first watertrap device arranged on a first side of the longitudinal axis, the vapor separator comprising a buoyant body rotatably mounted about a pivot axis, the pivot axis extending in a direction generally transverse to the longitudinal axis of the watercraft.
A personal watercraft comprising a hull defining a longitudinal axis and including an engine compartment, a propulsion device supported by the hull, an internal combustion engine being positioned within the engine compartment and powering the propulsion device, a fuel supply system including a vapor separator and at least one charge former, the fuel supply system being configured to supply fuel from the vapor separator to the at least one charge former of the engine through a fuel supply line, an exhaust system configured to guide exhaust gases from the engine body to an exhaust discharge and including at least a first watertrap device arranged on a first side of the longitudinal axis, the vapor separator being positioned on a second side of the longitudinal axis, opposite the first side.
A personal watercraft comprising a hull defining a longitudinal axis and including an engine compartment, a propulsion device supported by the hull, an internal combustion engine being positioned within the engine compartment and powering the propulsion device, a fuel supply system including a vapor separator and at least one charge former, the fuel supply system being configured to supply fuel from the vapor separator to the at least one charge former of the engine, an induction system configured to guide induction air into the engine, a breather conduit connecting the vapor separator with the induction system, and a check valve disposed in the breather conduit, the check valve being configured to prevent water from flowing into the breather conduit and toward the vapor separator.
Dependencies are inferred from the claim text.