Gasoline fires should be fought with which extinguisher class?

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Gasoline fires involve a flammable liquid, so you need an extinguisher rated for Class B fires. Class B extinguishers are designed specifically for liquids like gasoline, oils, and solvents and work by smothering or interrupting the chemical reaction to stop the flame. Using a water-based extinguisher is unsafe on gasoline fires because water can spread the fuel and make the fire worse. Extinguishers for ordinary combustibles (wood, paper) or for cooking oils (Class K) won’t effectively suppress a gasoline flame, and extinguishers intended for electrical fires (Class C) address electricity, not the fuel. If electricity is a-factor, a combined Class B/C extinguisher would be appropriate, but for a straightforward gasoline fire, Class B is the correct choice.