What action is the best to take when fueling an outboard boat with a portable tank?

When fueling an outboard boat with a portable tank, it's best to do so on land, away from the water, to prevent spills and environmental contamination. Ensure the engine is off, and remove any ignition sources nearby. Use a funnel to minimize spills and always check for leaks or damage in the tank before fueling. After refueling, securely close the tank and store it in a well-ventilated area.