1998 Johnson Evinrude "EC" 25, 35 HP 3-Cylinder Outboards Service Repair Manual P/N 520205, Page 77Get this manual
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12 Remove the two screws secuing the fuel outlet fitting retainer to the oil mixing unit coverRemove the retainer, fitting, and O-ringDiscard the O-ringPinch the piston seal and piston seal 1" it off