00:00In the past, gas stations had an awkward problem.
00:03Customers had no idea when their tank was full, often causing gasoline to spill everywhere.
00:09Engineers came up with a clever solution.
00:11They invented a fuel nozzle that could automatically stop, using a very simple principle.
00:16When a fuel truck refills an underground tank, a valve automatically shuts off as the tank nears full,
00:23and the gasoline vapors are drawn back into the truck through another hose, condensing back into liquid fuel.
00:29When customers fill their cars, the gasoline first passes through multiple pipes and filters before reaching the nozzle.
00:37Modern fuel nozzles are like tiny technological marbles.
00:41Inside, there's a thin tube that draws air from the car's tank into a membrane chamber.
00:46When you pull the trigger, fuel flows until the tube is submerged, cutting off the airflow.
00:52This creates a vacuum that pulls three small steel balls to the center, instantly releasing the trigger.
00:59And stopping the flow.
01:01Simple, efficient, and brilliantly effective.
