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At normal outdoor ambient temperatures, and trying to light the fuels in their simple liquid states, petrol will ignite VERY easily, Diesel will not.

If you soak a rag with the fuels - again the petrol will ignite and burn very easily with a 'whoosh'. The diesel soaked rag will ignite but it may take a few seconds to get going and flame will spread relatively gently across the rag.

Inside the engines it is a different story, the diesel is ignited by compression and this actually causes it to explode rather than burn.

In both cases it is the vapour given off that burns, not the liquid.

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Q: Who catches fire more quickly diesel or petrol?
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Which catches fire more quickly petrol or diesel?

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