1969 Evinrude 40 HP Big Twin, Big Twin Electric Lark Service Manual 4596, Page 28Get this manual
CLEANING, INSPECTION, AND REPAIR aThe fuel pump operating components are not serviced separatelyIf malfunction occurs, replace the complete pumpbInspect the filter for accumulation sediment by removing the filter cap screw and the filter capSee Figure 3-22cClean all parts of the filter assembly and fuel connectors in solvent and blow dryDO NOT dry parts with cloth, as lint may stick to the parts and clog the passages or prevent the fuel pump valves from seatingDissolve any gummy deposits with OMC Accessory Engine Cleaner (certain solvents will not dissolve these deposits)NOTE
It is recommended that new gasket be in-
SCREENLEAF VALVE