Gasoline hoses have a tiny hole at the tip. Without any chips, it's the smartest part of the entire pump

A small hole in the fuel nozzle uses the Venturi effect to sense airflow.

When gasoline reaches that opening, the airflow changes and a diaphragm is triggered.

That mechanical movement releases a lever and closes the valve, stopping the fuel flow automatically.

The system works without electronics and helps prevent spills, fire risk, and contamination.