CROWN COPYRIGHT / HEALTH & SAFETY LABORATORY SCIENCE PHOTO LIBRARY CROWN COPYRIGHT / HEALTH & SAFETY LABORATORY SCIENCE PHOTO LIBRARY
Diesel fuel cap. Close-up of a fuel cap labelled with the word 'diesel'. Diesel is used as a fuel in motor vehicles, and as a heating oil. It is heavier than petrol, the other fraction of crude oil used as a fuel in motor vehicles. Diesel engines must not be run on petrol, so fuel tanks and caps are prominently labelled to avoid the incorrect fuel being added.
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