Dont pump full tank of petrol

Attention: Car Owners

Many of us are not aware that the petrol kiosk pump has a return pipe-line (in purple colour). When the petrol tank (in the car) reaches the full level, there is a mechanism to trigger off the pump latch and at the same time a return-valve is opened (at the top of the pump station) to allow excess petrol to flow back into the sump. But the return petrol has already pass through the meter, meaning you are donating the petrol back to the petrol kiosk!!