Car Bike Review on Instagram: "That subtle “click” at the fuel pump is smarter than it seems. Here’s the simple science behind it: • A small hole near the nozzle tip allows air to flow as fuel is pumped. • As the fuel level rises and blocks this hole, the airflow stops. • The pressure change creates a vacuum, which activates the shutoff valve. • As a result, the pump stops automatically within a split second. This clever mechanism helps prevent: • Fuel overflow • Spillage on your vehicle or the