Abstract: A marine propulsion system includes an internal combustion engine; a fuel reservoir; a pump that pumps fuel from the fuel reservoir to the internal combustion engine; and a fuel filter that filters the fuel. The fuel filter includes a canister and a fuel inlet that conveys the fuel adjacent to cylindrical sidewalls of the canister so that the fuel immediately spirally flows around and down the cylindrical sidewalls under centrifugal force and under force of gravity, and then is drawn radially inwardly through a filter element by the pump. A fuel outlet extends at least partially along a center axis of the canister and discharges the fuel from the canister. A drain is located at the bottom of the canister and configured to drain water that separates from the fuel as the fuel flows around and down the cylindrical sidewalls.

Abstract: A filter for a water cooling system in a marine drive includes a cavity having an upper side and a lower side, a water inlet that delivers a water flow into the cavity, and a water outlet that delivers water out of the cavity. The flow velocity of water within the cavity is low such that heavy debris sinks toward the lower side of the cavity and buoyant debris floats toward the upper side of the cavity. An upper debris outlet expels the buoyant debris out of the cavity and a lower debris outlet expels the heavy debris out of the cavity.

Abstract: A cooling system for a marine engine has a cooling jacket disposed in thermal communication with a heat-emitting portion of the marine engine. The cooling jacket has a water inlet, and a water outlet on an upper portion of the cooling jacket. A pump is connected in fluid communication with the water inlet and/or the water outlet that causes water to flow through the cooling jacket in order to cool the heat-emitting portion, wherein a flow velocity of water in the cooling jacket is low such that debris sinks to a lower portion of the cooling jacket. A debris outlet is in the lower portion of the cooling jacket that expels the debris from the cooling jacket.

Abstract: An outboard motor cooling water distribution system directs water from the water jacket of an engine through a container in which a conduit has a first inlet opening that is configured to cause a water stream to entrain debris from a region near a drain opening of the container and prevent the debris from building up in the vicinity of the drain opening. Debris which is heavier than the water is drawn upwardly through the first inlet opening of the conduit and conducted away from the container. Debris which is lighter than water is entrained in a second water flow and conducted through a second inlet opening of the conduit so that it can be drawn into the conduit and conducted away from the container. The creation of the first water flow maintains the area around the drain opening in a clean condition as a result of the velocity and direction of the water flow caused by the position and size of the first inlet opening of the conduit.

Abstract: A marine engine fuel system provides a low pressure lift pump to draw fuel from a fuel tank and cause the fuel to flow into a reservoir and a high pressure fuel pump which draws fuel from the reservoir and provides it to a fuel rail. An inlet conduit of the high pressure fuel pump is provided with a primary and a secondary opening. The secondary opening can be an orifice formed through a wall of the inlet conduit. The secondary opening is positioned, relative to the primary opening, at a location which assists in controlling the fuel level within the reservoir and the quantity of gaseous fuel contained within an ullage above the liquid pool of fuel.