1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 98Get this manual
Inline Fuel FilterCleaningInspection and Repair 1Unscrew in line filter cover fuel hoses to service filter
It is not necessary to unclamp
2Clean filter cannister and shake filter element to remove collected particles3Clean 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 Engine Cleaner (certain solvents will not dissolve these deposits)4Inline filter is serviced as complete assembly onlyIt is only necessary to replace if parts are damaged
Fuel Pump and Filter
Before replacing troubled fuel pump, remove and clean the fuel filter and install new filter elementAlso remove the fuel line from the fuel tank and blow through all passages and lines with compressed air to be sure they are openThis may be the cause of inadequate fuel delivery, and if so, would eliminate unnecessary replacement of the fuel pumpIf this procedure does not correct the trouble, fuel pump is probably malfunctioning and should be replacedTo install new filter element, remove the screw retaining the fuel pump cover to the fuel pumpWhen installing the filter elementplace the lip of the element toward the gasket Install the fuel pump cover and tighten the screw securely