It is an easy mistake to make when the fuel pumps are not clearly labelled. At a Shell Service Station near me both petrol and diesel are called "V-Power", the petrol is called "V-Power unleaded" to distinguish it from the diesel. I thought that diesel does not contain lead so why is the word "petrol" not used? There is a space for the word "petrol" near the nozzle. The hoses are all black. The BP Service Station has green hoses for petrol, black for diesel and has clear labels.