How Does a Petrol Pump Know When to Stop?

Описание: A tiny sensing hole helps a conventional automatic petrol nozzle stop the flow. Follow the air passage, diaphragm and latch—and see why a splash can trigger an early click.

Conceptual diagrams show the pneumatic shutoff mechanism, not the exact internal geometry of every nozzle or a measurement of tank capacity.

Sources (checked 30 October 2026):
ELAFLEX ZVA Slimline manual (11.2019), English p.4 and diagram p.16: sensing port, vacuum, diaphragm and shutoff.
https://elaflex.de/dokumente/download...

Husky technical bulletin (linked original: May 2008), Nozzle Design: Venturi vacuum, latch and main valve.
https://www.husky.com/technical-bulle...

Husky (2018), splash covering the sensing port and early shutoff.
https://www.husky.com/eliminate-diese...

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