1967 Evinrude StarFlite 80 HP Outboards Service Manual, PN 4359, Page 26Get this manual
OIL DRAIN VALVE aThe oil drain valve ordinarily requires little or no attention; however, when servicing the motor, remove and clean the drain valve, ani screensSee Figure 3-30bIf gum or varnish is found in the crankcase during servicing, clean the drain valve plate assembly in OMC Accessory Engine Cleaner, as it is likely that gum and varnish have also been deposited there
proper fuel mixturePetroleum gum and varnish which precipitate from stale mixture may clog the filter screen and any small orifices, interferring with starting and normal runningFor proper fuel mixture, see Owner's ManualTo assure that the fuel tank contains the proper mixture, drain and flush the tank at least once year, and at every tune-up or major repair To facilitate complete draining of the tank, drain screw is provided in the fuel tank upper housingSee Figure 3-31Clean the tank by flushing with clear gasoline or solventSee Owner's Manual for correct fuel mixture DESCRIPTION The fuel tank is of Simple but rugged construction, with capacity of gallons of fuel mixtureIt includes the bulb primer (for priming the fuel pump), fuel level gage, fuel hose and connectors, bracket arrangement to hold the fuel line when not in use, and carrying gripThe fuel tank upper housing, which provides the connection to the fuel hose, contains two release valves and disc valve which prevent any escape of gasoline or fumes, minimizing the danger of explosion or fire