Answer:
Connect the outboard boat to the earth
Step-by-step explanation:
During re-fueling, small charges are generated. These charges result in some small electrostatics being generated. The generated static energy results in small electric sparks. If the object is not properly earthed, the will be a fire even from a very small spark. Thus, an earth system is needed to prevent a fire from taking place. The earth absorbs excess electrons. This prevents fires from taking place.