If a large fuel spill occurs, what is the most critical action?

The most critical action during a large fuel spill is to stabilize the situation with a foam blanket. When fuel is spilled, it creates a significant fire hazard, as fuel is highly flammable. Foam blankets serve a crucial role by suppressing vapors and preventing ignition, thereby reducing the risk of combustion. The foam forms a barrier on top of the fuel, limiting the interaction between the fuel and the air, which can help to control the spread and impact of the spill.

While other actions, such as cordoning off the area or suctioning the fuel, may be part of a larger response plan, they do not directly address the immediate fire hazard posed by the spill. Stabilizing the spill with foam is a proactive measure that directly mitigates fire risks, providing time for further response and clean-up efforts to be executed safely.