How do I open the fuel door for the Opel Astra? Leah September 30, 2024 01:10 Locate the fuel door on the outside of the vehicle. It should be on the right side. Firmly press down on the fuel door and it will pop open. To close it, press down on the fuel door. Related articles Should I refuel the Opel Astra with diesel or petrol? How do I adjust the seat in the Opel Astra? How much luggage can I fit in the Opel Astra’s boot? How do I release the boot of the Opel Astra? How do I adjust the side mirrors in the Opel Astra?