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293 - FAA PPL(A) USA - The purpose of the fuel tank vent system is to:

Question 293 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

allow air to enter as fuel is consumed to maintain atmospheric pressure inside the tank
allow for the proper air to fuel ratio when flying at higher altitudes
increase pressure in the tank to move fuel to the engine intake

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane