Recently I came across a very useful tip. I was surprised to know it but had a doubt so I talked to one of the pump technicians & he too accepted it as a fact. I think apart from providing space for the gas generated inside the petrol tank this is yet another reason why we shouldn't fill the tank to the brim.
Many of us are not aware that the petrol kiosk pump has a return pipe-line (in Pink ). When the petrol tank (in the car) reaches 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 Oil Dealer
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