Posted on 11/28/2025
Every fuel nozzle has a built-in way to sense when your tank reaches the right level and stop the flow automatically. It is a clever mix of airflow, vacuum, and a small mechanical valve in the handle. Knowing how it works explains early click-offs, splashback, and why topping off is not a good idea. What The Nozzle Is Sensing Near the tip of the nozzle, there is a tiny sensing port. While you pump, air flows past that port, up ... read more