2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 152Get this manual
FUEL SYSTEM OMS PUMP Remove the Torx screws securing fuel inlet housing to the intermediate housingAs the fuel inlet housing is lifted straight up, the oil piston will be drawn out of the oil pumpHold the intermediate housing with the air motor diaphragm DOWNand push the fuel diaphragm downTurn the air motor diaphragm counterclockwise to loosen, and spin the air motor diaphragm offThe stem will unscrew from either the fuel diaphragm piston or the air motor diaphragm piston