Usually a button or when full manually Even though we think it is a mechanism that is stopped, this is not true.

Well then How come not even a drop from the gas pump ends up on the ground when the tank is full?

The fuel pump does not have an automatic stop mechanism.

In other words: the gas station attendant does not intervene when filling gas, as we always thought. To understand this situation, it is necessary to know something about the working principle of the gasoline pump. At the end of the pump there is a nozzle and at the end of this nozzle there is a small hole. This hole runs through a pipe It is connected into the pump. As fuel is added, air continuously flows through this line.

fuel tank The increase in fuel level when the tank is full fills this gap. When the hole is closed, the air flow through the pipe is interrupted and a kind of vacuum is created inside, that is, an air gap.

This vacuum activates a mechanism in the pump.

This mechanism automatically closes the held trigger section and stops the fuel flow. Behind this completely mechanical process,Venturi effect” is included. The Venturi effect, which we also know from physics, is a situation that occurs when the pressure changes when a liquid or gas flows through a narrow space.

The fuel pump detects this pressure change and stops automatically when the tank is full. The basis of this effect is that when gasoline flows through a narrow space, its speed increases and static pressure decreases. There is a second very small pipe at the mouth of the pump. This gives the system a from the point of constriction comes in.

The pressure in the constricted part, realm Since the pressure is lower than the air pressure, the air is sucked through the small mouth and gasoline is pumped into the car.

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