1968 Evinrude Big Twin, Big Twin Electric, Lark 40 HP Outboards Service Manual, Page 28Get this manual
CLEANINGINSPECTIONAND REPAIR The fuel operating components not serviced separatelyIf malfunction occurs, place the complete Inspect the filter for accumulation sediment removing the filter screw and the filter See Figure 3-22Clean parts of the filter assembly and fuel connectors in solvent and blow dryDO NOT dry parts with cloth, as lint stick to the parts and clog the passages prevent the fuel valves from seatingDissolve any gummy deposits with Accessory Engine Cleaner (certain solvents will not dissolve these deposits)NOTE
It is recommended 'that
Figure 3-23Oil Drain Valve assure that the fuel tank contains the mixture, drain and flush the tank at least once and at every tune-up major repairfacilitate complete draining of the tank, drain screw is vided in the fuel tank housingSee Figure 3-24Clean the tank flushing with clear gasoline solventDESCRIPTION The fuel tank is of simple but rugged construction, with capacity of gallons of fuel mixtureIt includes the bulb primer (for priming the fuelfuel level gage, fuel hose and connectors, bracket arrangement to hold the fuel line when not in useand carrying gripThe fuel tank housing, which provides the connection to the fuel hose, contains two release valves and disc valve which prevent any escape gasoline fumes, minimizing the danger of explosion fire