There are a number of reasons why you should turn your vehicle off while refuelling. A petrol-run car’s ignition system can run voltages of up to 45,000 volts. A catalytic converter, which is exposed under the car, can reach temperatures of 900 degrees Celsius. Petrol is explosive, and can be ignited with the slightest spark, and even if you don’t spill any fuel yourself, any other fuel spillage at the service station has the potential to be ignited by a running vehicle. For the safety of others around you, always switch off your vehicle’s engine when refuelling.