When fuel burns it actually turns into a vapour first. It's the vapour that does the burning. It is used to heat the peoples' homes in colder countries. When kerosene gets hot it turns into vapour even faster. So kerosene burns strongly. Fuels are usually changed to vapours before they actually burn. Even a wax candle at first forms a liquid, and then vaporizes to feed the flame. The heat of a burning flame makes fuel vapourize more quickly, but some fuels vapourize more readily than others and are thus more efficient. The petroleum family is the most famous example. Their strong hydrocarbon content is very combustible, and they vapourize well. Refining of crude oil into fuels takes advantage of the different vapourization temperature of each fuel refined.
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