Class-B fires (hydrocarbons, petroleums, and fuels on fire) require much different handling than the standard water approach. Many fuels, such as gasoline or oil float on water, and water would actually end up spreading the fire further.
One way to control a class-B fire would be to dump chemical dust on it—this is also a method for handling class-A fires, and actually tends to be preferable because sprayed water tends to cause property damage.
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