What is the preferred method of extinguishing a gasoline fire?

The preferred method of extinguishing a gasoline fire is through foam application. Foam creates a barrier between the gasoline and the atmosphere, effectively suppressing the fire by preventing oxygen from reaching the fuel. This is particularly important with flammable liquids like gasoline, which can reignite if not properly smothered.

Foam is designed to seal the surface of the liquid, which not only puts out the fire but also helps to minimize the release of flammable vapors, reducing the risk of re-ignition. It is especially effective on Class B fires, which involve flammable liquids, making it an ideal choice for this type of fire.

In contrast, while dry chemical and carbon dioxide extinguishers may also be effective in some situations, they do not provide the same level of control over re-ignition as foam does. Water application is generally ineffective and can even exacerbate the situation by spreading the flaming gasoline. Thus, foam application stands out as the best method for extinguishing a gasoline fire, ensuring both immediate suppression and longer-term safety.