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On a piston engine aircraft, the vent lines in the fuel system are installed to…

  • A
    allow a person to take a sample of the fuel and to empty the fuel tank for maintenance.
  • B
    allow the excess fuel to flow out of the tank after refuelling.
  • C
    remove particles and impurities from the fuel that could damage the engine.
  • D
    allow atmospheric pressure to enter the fuel tank in order to avoid a vacuum.

Refer to figure.
FUEL VENT SYSTEM
Fuel tank vents allow air into the fuel tank to replace the volume of fuel consumed by the engine and to allow for equalization of pressure (avoiding negative pressure) as the aircraft climbs or descends which helps to reduce evaporation and aids fuel transfer.

  • When the fuel tanks are located in the wings, the fuel-tank vent will typically have a forward-facing ram tube. The ram air intakes are located on the underside of the wings.

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