Abstract: A spill resistant fuel cap and ventilation system to prevent fuel from spilling during the boat refueling process and when internal fuel system pressure increases, and for maintaining the internal pressure of the fuel system at a predetermined level, wherein the system comprises a fuel fill neck fluidly connected to a tank, the fuel fill neck having two venting apertures defined by it with one venting aperture in fluid communication with the tank and the other aperture in fluid communication with an air intake vent, such that the system provides two vapor and air venting paths for removing vapor and air during refueling and for relieving pressure, respectively, and such that an air intake venting path is formed for inducing air into the system through the fuel fill neck to prevent pulling vacuum in the tank during boat engine operation.

Abstract: An improved marine engine exhaust system for discharging engine exhaust above the water line when at idle or low speeds, and below the surface of the water at high speed in a submerged turbulent region generated by a hydrodynamic fitting fixed to a the undersurface of the vessel hull, wherein the gas is maintained for a period of time, until the low pressure area following the vessel has passed.

Abstract: A shaft pressure ring for use in conjuction with a boat having an inboard motor and a drive shaft protruding through a shaft logseal assembly mounted in the hull of the boat, the hull including a shaft log area surrounding the drive shaft, the shaft pressure ring comprising a deflector, the deflector having an inside diameter being annular in shape, the deflector being of a rigid material and adapted to be positioned upon the drive shaft a sufficient distance from the seal such that the shaft pressure ring will deflect a portion of the water passing beneath the hull of the boat in a direction toward, and onto, the shaft log seal. The splasher will continuously lubricate and cool the shaft log seal to prevent drying, burning, deterioration, and eventual leakage.