1991 Johnson/Evinrude EI Outboards 2.3 thru 8 Service Manual, Page 63Get this manual
In-line Fuel Filter f51 1Remove in-line filterIt is necessary to unclamp fuel hoses to service filter2Clean and shake filter element to remove collected particlesf51 3Clean 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 seating Dissolve any gummy deposits with OMC Engine Cleaner (certain solvents will not dissolve these deposits)4In-line fuel filter is serviced as complete assembly onlyReplace the filter once year
Shut-off Valve3, 4
f61 Disconnect linkage to shut-off valveRemove gum and varnish