1971 Evinrude Fisherman 6HP outboards Service Manual, Page 22Get this manual
tank and blow through all passages and lines with compressed air to be sure they are openThis may be the cause of inadequate fuel delivery, and if so, would eliminate unnecessary replacement of the fuel pump If this procedure does not correct the trouble, fuel pump is probably malfunctioning and should be replaced REMOVAL OF FUEL PUMP AND FILTER
aDisconnect hoses from pump and filter assemblybTo remove fuel filter, remove screw and cover attaching filter to fuel pumpSee Figure 3-20Figure 3-19 Throttle Cam Adjustment NOTE Allow motor to reach normal operating temperature by running in tank with test propeller in gear, at one-half throttle or slightly more before proceeding to next stepcWith motor at operating temperature, run at slow speed (700750 rpm) with test propeller in tank or on boatAdjust low-speed knob until motor runs fastest and smoothest performance is obtainedAllow 15 seconds for motor to respond to adjustmentdReplace low-speed valve knob with low-speed control knob in normal running positionDO NOT disturb position of needle while installing knobeWith low speed needle and cam correctly adjusted, motor should idle at 550 rpm IN GEARcTo remove fuel pump, remove two screws attaching pump to power head, and remove pump assemblySee Figure 3-20