How to open FIAT 500 fuel cap?

The FIAT 500's gas tank can be located on the rear passenger side of the vehicle, inside cargo frame. When re-fueling open the door by depressing the indention on the left-hand side of the flap. The gas cap features a spring-loaded opening that is self-closing and does not require releasing. To fill, insert the fuel nozzle until the nozzle shuts off. Wait 10 seconds to allow residual gas to drain out. Replace the door by snapping into place. The 500 holdS-10.5 gallons of premium unleaded gasoline with an octane rating of 97 or higher In some vehicles higher octane levels are required for proper firing, and cars using more compression in the combustion chamber often need premium gas.