1971 Evinrude Fisherman 6HP outboards Service Manual, Page 23Get this manual
Figure 3- 22Fuel Tank Upper Housing 3-22 Clean the tank by flushing with clear gasoline or solventPrimer pumpscreens, etc may be inspected and cleaned as described belowRefill the tank with the corre ct fuel mixture DESCRIPTION
Figure 3-21Oil Drain Valve
OIL DRAIN VALVE
a The oil drain valve ordinarily requires little or no attention; however, when servicing the motor, remove and clean the drain valve See Figure 3-21