1978 Johnson 55 HP Outboards Service Manual, Page 31Get this manual
FUEL PUMP AND FILTER Before servicing or replacing fuel pump, remove the fuel filter screen, and install new filter screenSee Figure 3-27Also remove the fuel hose from the fuel tank and blow through all passages and lines with compressed air to be sure they are openIf clogged lines are the cause of the difficulty, this procedure would eliminate unnecessary servicing of the fuel pumpIf this procedure does not correct the trouble, fuel pump is probably malfunctioning and should be replacedREMOVAL OF FUEL PUMP AND FILTER aDiscOlmect hoses from pump and filter assemblybTo remove fuel pump, remove three screws attaching pump and filter assembly to crankcase, and remove pump and filter assemblySee Figure 3-27