Is it advisable to use a powder extinguisher to stifle burning fuel e.g. after a collision with a car?

Dry powder fire extinguishers are a universal extinguishing agent, effective against fires involving flammable liquids (Class B), which include petrol or diesel fuel. The powder works by cutting off the oxygen supply to the source of the fire, which is crucial to extinguish it. As this is compulsory equipment for every car, its use in the event of a fuel fire is highly advisable.