Many of us are not aware that the Gas pump has a return pipe-line . When the gas (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 gas to flow back into the sump. But the return gasoline has already pass through the meter, meaning you are donating the gas back.
Do Not Pump Full Tank Of Gas ( Petrol )
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