Do not force an incorrectly sized fuel pump nozzle into the filler neck. Forcing an incorrectly sized fuel pump nozzle into the filler neck may result in damage to the vehicle.
Vehicles with a diesel engine may have an active misfuelling protection device. A metal flap is visible in the filler neck when the fuel filler cap is removed. The active misfuelling protection device helps to prevent the fuel tank from being filled with the incorrect fuel, e.g., petrol. Refuelling is permitted if a correctly sized, diesel fuel pump's filler nozzle is inserted, fully and squarely, into the vehicle's fuel filler neck, as illustrated.
To refuel with a fuel can, use the emergency funnel supplied with the vehicle. See RUNNING OUT OF FUEL.
Misfuelling devices are dependent on the market specification.