1994 Johnson/Evinrude "ER" 9.9 thru 30 outboards Service Manual, Page 27Get this manual
FuelOil Mixing Instructions To be used if engine's AccuMix automatic oiling system is not desiredGasoline is extremely flammable and highly explosive under certain conditionsAlways stop engine and do not smoke or allow open flames or spark near the boat when refueling or changing fuel tanksAlways mix in well ventilated area f11 Portable tankPour approximately gallon (4 liters) gasoline
into tank and add required lubricantReplace filler cap securelyThoroughly mix by shaking tankAdd balance of gasolineBuilt-in tanksTo prevent static spark, use large metal filter funnel as shown in figureThe fuel nozzle must contact the metal funnel when filling the tankTwo methods for refueling built-in tanksMix the lubricant slowly with the fuel as the tank is filled Using separate container, mix all the necessary lubricant with gallon (4 liters) of fuel and pour this mixture slowly with fuel as tank is filled