What is the best course of action if a fire is in the engine space of a boat?

When dealing with a fire in the engine space of a boat, shutting off the fuel supply is crucial because it helps prevent the fire from spreading and reduces the risk of an explosion. Fuel can ignite and contribute to the intensity of the fire, so stopping the flow of fuel is essential in controlling the situation.

Using water immediately is typically ineffective for fuel-based fires, as water can cause the fire to spread. Opening the engine cover can expose the fire to oxygen, which may intensify it rather than extinguish it. Signaling for help is important, but it should be done after taking immediate actions to mitigate the fire. Therefore, shutting off the fuel supply is the most critical first step in firefighting on a boat.