When should you open windows and hatches when fueling your boat?

You should open Windows and hatches when fueling your boat to ensure proper ventilation and minimize the risk of accumulating harmful fumes. This is particularly important when using gasoline, as vapors can be dangerous. Always ensure that the area is well-ventilated before starting the fueling process, and keep them open until the fueling is complete and the area is safe. Additionally, it's advisable to turn off any sources of ignition while fueling.