aircraft systemsFAA-published question bank (Private Pilot, 2008)
On aircraft equipped with fuel pumps, when is the auxiliary electric driven pump used?
A
All the time to aid the engine-driven fuel pump.
B
In the event engine-driven fuel pump fails.✓ Correct Answer
C
Constantly except in starting the engine.
Explanation
PHAK Chapter 7 explains that in fuel-pump systems the electric boost pump supplies fuel pressure for starting and serves as a backup if the engine-driven pump fails (and is used for takeoff and landing when the POH calls for it). It is not run constantly to assist the engine-driven pump.
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