Definition
A pump that is mechanically powered by the airplane's engine, typically through a direct drive off the engine accessory section, used to move fluid (most commonly fuel or hydraulic fluid) under pressure as long as the engine is turning.
Plain English
A pump that the engine itself spins. As long as the engine is running, the pump runs and moves fluid through the system. If the engine stops, the pump stops.
Context Anchor
You will see this term in fuel system discussions and in engine failure troubleshooting, especially when checking whether fuel is still reaching the engine.
Why Pilots Care
Engine failure stops the pump immediately, removing hydraulic power or instrument suction and forcing use of emergency procedures or backups.
Intuition Check
Engine-driven does not mean it is a backup pump or an electric pump. It means the pump gets its power from the engine’s motion, so if the engine is not turning, the pump is not doing its normal job.
Example Sentence 1
After the engine lost power, the engine-driven fuel pump stopped delivering fuel, so the pilot turned on the electric boost pump.
Example Sentence 2
Normal vacuum for the attitude indicator comes from the engine-driven pump during routine flight.