your filler cap is securely fastened
When learning to drive it is a good idea to practise filling your car with fuel. Ask your instructor if you can use a petrol station and fill the fuel tank yourself. You need to know where the filler cap is located on the car you are driving in order to park on the correct side of the pump. Take care not to overfill the tank or spill fuel. Make sure you secure the filler cap as soon as you have replaced the fuel nozzle.
B your tank is only three quarters full
C you have used a locking filler cap
D you check your fuel gauge is working