Abstract: An air intake device for a vertically oriented multi-cylinder outboard boat engine having an engine block, a crankcase, and vertically spaced fuel intake ports. The air intake device includes a surge tank rigidly attached to the crankcase and having a plurality of vertically spaced air intake union pipes extending from the surge tank, and an intake manifold cover rigidly attached to the engine block and having a plurality of vertically spaced air intake union pipes extending from the intake manifold cover. A flexible air intake hose is connected between the air intake union pipes extending from the surge tank and the air intake pipes extending from the intake manifold cover.

Abstract: An air intake device for a vertically oriented multi-cylinder outboard boat engine having vertically spaced fuel intake ports. The air intake device includes a surge tank, a plurality of vertically spaced air intake pipes extending from the surge tank to the engine intake ports. The intake pipes are inclined downward from the surge tank. The bottom tangent of the lowermost intake pipe is aligned with the bottom surface of the surge tank and the vertical length of the surge tank is less than the total length from the uppermost intake port to the lowermost intake port.

Abstract: An air intake device for a vertically oriented multi-cylinder outboard boat engine having an engine block, a crank case, and vertically spaced fuel intake ports. The air intake device includes a surge tank attached to the crank case and having vertically spaced air intake pipes extending from the surge tank to the engine intake ports. An insulation layer is mounted between the surge tank and the crank case.

Abstract: A fuel supplying system for a vertical engine provided with multiple cylinders arranged in a vertical direction, respectively, in an installed state of the engine and a crankshaft disposed vertically therein, comprising a plurality of fuel supplying means disposed for the cylinders, respectively, said fuel supplying means being divided into plurality of groups. A plurality of fuel pumps each disposed for each of said groups of the fuel supplying means, said fuel pumps being arranged below the fuel supplying means at a lowest position of the corresponding each group of the fuel supplying means. Further, a plurality of fuel diverging means operatively connecting the fuel pumps to the each group of the fuel supplying means, respectively, said fuel diverging means being connected to each other through connecting means.