How do I open the fuel door for the Opel Mokka? Leah March 05, 2024 06:36 Updated Make your way to the fuel door side of the Opel Mokka, and firmly press down. You'll see the mini door pop out. Related articles Do I top up diesel or petrol for the Opel Mokka? How do I open the boot of the Opel Mokka? Where is the parking brake on the Opel Mokka? How do I switch on/off the headlights for the Opel Mokka? How do I adjust the seat for the Opel Mokka?