Definition
The intentional discharge of fuel from an aircraft's fuel system into the atmosphere, distinct from a normal jettison or emergency dump. Includes any release of fuel as a vapor or liquid through fuel system vents, but not minor losses such as those caused by normal evaporation or by the operation of fuel pumps and engines.
Plain English
Fuel being released from the aircraft on purpose, usually through small vent openings in the fuel system, rather than leaking or being dumped in an emergency.
Context Anchor
You may see this term in emergency handling, ATC coordination, fuel system discussions, or reports of fuel coming from an aircraft in flight or on the ground.
Derivation
Vent' comes from the Latin ventus, meaning wind. A vent is an opening that lets air or vapor pass. In a fuel system, the vent allows the tank to breathe so fuel can flow without creating a vacuum or pressure build-up.
Why Pilots Care
Blocked or restricted vents can starve the engine of fuel or collapse the tanks; visible venting shows the system is managing pressure but may mean some fuel loss.
Intuition Check
Do not assume fuel venting means normal engine fuel use. It means fuel or fuel vapor is being released from the fuel system to the outside air.
Example Sentence 1
The aircraft's fuel system is designed to limit fuel venting during climbs and descents when tank pressures change.
Example Sentence 2
Clear fuel vents allow proper pressure equalization so the engine receives steady fuel flow throughout the flight.