What is the first step to minimize fumes after fueling a boat?

Opening all openings on the boat is crucial as the first step in minimizing fumes after fueling. By allowing for maximum airflow, you enhance the ventilation throughout the vessel, which helps to disperse any harmful fuel vapors that may have accumulated during the fueling process. This is an essential safety measure because fuel vapors can be flammable and pose serious risks if not adequately ventilated.

Proper ventilation reduces the concentration of these vapors and helps prevent the risk of ignition, which can be particularly dangerous in enclosed areas. While the other options may contribute to safety practices, they are generally steps that come after ensuring good airflow is established. For instance, running the bilge exhaust blower is an excellent follow-up action, as is checking for fuel vapors; however, these steps are most effective once the boat is already well-ventilated.