1. Open the fuel filler cap on the passenger side of the car.
2. Remove the two bolts that hold the fuel filler neck in place.
3. Disconnect the fuel filler neck from the fuel tank.
4. Carefully lower the fuel tank from the car.
Here are some tips for accessing the fuel tank in a Vauxhall Corsa:
* Make sure that the car is turned off and parked in a safe location.
* Allow the car to cool down if it has been recently driven.
* Use a funnel to avoid spilling fuel when draining the fuel tank.
If you are having trouble accessing the fuel tank in your Vauxhall Corsa, you can always take it to a mechanic for assistance.