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A fuel-lubricating oil proportioning and mixing device for mixing an appropriate quantity of lubricating oil with an appropriate quantity of fuel in the fuel tank of an internal combustion engine, principally for motor boats powered by two-cycle engines. The device of the invention comprises a lubri

A fuel-lubricating oil proportioning and mixing device for mixing an appropriate quantity of lubricating oil with an appropriate quantity of fuel in the fuel tank of an internal combustion engine, principally for motor boats powered by two-cycle engines. The device of the invention comprises a lubricating oil reservoir separate from the fuel tank and a graduated measuring container connected to the oil reservoir through a solenoid actuated two-position valve and a reversible pump. The oil measuring container is connected to the fuel tank filler through the pump, the valve and a discharge line. After a known quantity of fuel has been taken in the fuel tank, the pump is actuated to draw from the oil reservoir through the valve an appropriate proportional quantity of oil into the measuring container. After a desired quantity of lubricating oil has been pumped into the measuring container, the pump is reversed while the valve is simultaneously activated to be disconnected from the lubricating oil reservoir and connected the fuel tank oil discharge line to discharge the measured quantity of lubricating oil into the fuel tank.

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A fuel-lubricating proportioner and mixer for discharge into a fuel tank, comprising in combination: a lubricating oil reservoir; a graduated lubricating oil measuring container; a reversible pump connected to said measuring container; two-way valve means; first conduit means interconnecting said va

A fuel-lubricating proportioner and mixer for discharge into a fuel tank, comprising in combination: a lubricating oil reservoir; a graduated lubricating oil measuring container; a reversible pump connected to said measuring container; two-way valve means; first conduit means interconnecting said valve means and said pump; second conduit means interconnecting said oil reservoir and said valve means; third conduit means interconnecting said valve means and the fuel tank; means for controlling the position of said valve means enabling said pump to convey a measured quantity of oil from said oil reservoir to said measuring container when said valve means is in a first position and said reversible pump is moving in a first direction and for enabling said pump to convey said measured quantity of oil from said oil reservoir to the fuel tank when said valve means is in a second position and said reversible pump is moving in a second direction.