1988 Johnson Evinrude "CC" 9.9 thru 30 Service Manual, P/N 507660, Page 82Get this manual
In-line Fuel FilterAll Models Commercial Models f7l 1Unscrew in-line filter cover It is not necessary to unclamp fuel hoses to service filterf7l 2Clean filter cannister collected particles
and shake filter element to remove
f7l Clean 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)4 In-line filter is serviced as complete assembly onlyIt is only necessary to replace if parts are damaged