Which of the following is recommended as part of the annual maintenance program for a gasoline-powered boat?

The recommendation to examine thru-hull fittings for signs of leakage or corrosion is crucial in an annual maintenance program for a gasoline-powered boat. Thru-hull fittings are critical components that allow the boat to intake water for various systems, such as cooling the engine or draining waste. Over time, these fittings can deteriorate due to exposure to water, chemicals, and environmental conditions, leading to potential leaks that could result in serious issues, including flooding or engine failure. Regular examination allows for early detection of problems, which can then be addressed to ensure both the safety and functionality of the vessel.

While cleaning the exterior hull, replacing fuel lines, and testing battery life are all important maintenance tasks, they do not directly address the critical integrity of the parts that allow water to enter and exit the boat. Therefore, the assessment of thru-hull fittings specifically targets a vital aspect of maintaining safety and performance in gasoline-powered boats.