Neither a gasoline or electrical fire should be put out by water. A gasoline fire should be put out by a fire extinguisher labeled A B C. An electrical fire should first have the power switched off. Then the fire extinguisher should be used.
Water should not be used to extinguish a gasoline fire because the gasoline will stay on top of the water which can spread the fire quicker. The best thing to use is a fire extinguisher.
True, you should not try to put out a gasoline or diesel fire with water. This would make the fire spread. Smother the fire with something non-flammable such as a safety blanket, or use a proper fire extinguisher.
You would be better off using sand to smother a gas fire assuming it's not a large blaze. Gasoline floats on top of water, so you would in effect spread the fire if you used water.
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B-I
Most likely an extinguisher that uses sand or foam to choke the oxygen out of the flame because this type of fire is hard to put out with water or other means.
Gasoline and propain
Smother it- cutting off the air from the fire.
Put water on the coal
water
Mixing water with any burning oil is extremely dangerous. The oil/gasoline can splash away from the centre of the original fire cashing more fires to start, burn those trying to fight the fire etc. There are liquids used that are not water based but are liquid these are mostly used for chemical fires -On small oil fires form or Co2 gas is used to starve the fire of oxygen and put it out.