1972 Johnson 4HP Outboard Motor Service Manual, Page 22Get this manual
FUEL PUMP AND FILTER Before replacing remove and install new and gasketSee Figure 3-17move the line the tank and blow through passages and lines with compressed air to sure they the inadequate delivery, and if would eliminate replacement the If this cedure does not correct the trouble is malfunctioning and should replaced
REMOVAL OF FUEL PUMP AND FILTER
Disconnect correct before disconnectingand identify
remove filter, remove screw and cover attaching filter to fuel See Figure 3-17taching remove remove two screws atto power head, and remove See Figure 3-17
CLEANING, INSPECTION, AND REPAIR
The operating components are not serviced separatelyIf ma1function place the complete Clean parts the and connectors in solvent and blow dryDO NOT dry parts with cloth, lint stick to the parts and clog the passages prevent the valves from seatingDissolve gummy deposits with cessory Engine Cleaner (certain solvents wiH not dissolve these deposits)
Figure 3-17Fuel
and Filter
TESTING FUEL PUMP
Conduct this test
the motor in