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⛽ Ever wondered how a fuel nozzle knows when your vehicle’s tank is full?
It’s not magic — it’s brilliant engineering! 🔧🚗

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Inside every fuel nozzle, a tiny Venturi vacuum system constantly measures airflow.
As soon as the fuel level rises and blocks the nozzle’s sensing hole, the pressure suddenly drops. This triggers the automatic shut-off valve, stopping the fuel flow instantly and preventing overflow.

This smart mechanism protects your tank, saves fuel, and keeps you safe at the pump.

Watch the full explanation in simple animation!
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Tech
Transcript
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.
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