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To prevent vapour locking, which can lead to fuel starvation, a common type of limitation imposed by the Minimum Equipment List (MEL) in large transport aeroplanes for complete boost pump failure is…

  • A
    No fuel may be carried in the affected fuel tank.
  • B
    Maximum operating altitude limitation.
  • C
    Minimum fuel temperature limitation.
  • D

    Maximum operating speed limitation.

VAPOUR LOCK
Vapor lock results from fuel boiling. Ambient pressure drops at higher altitude. Thus fuel changes to liquid to vapour more easily. The operational result is little or no liquid fuel available for injection. If this occurs in a pipe it will block or restrict fuel flow thus creating a vapour lock.
  • In order to prevent a vapour lock, Fuel booster pumps are fitted inside the tanks which will pressurize the fuel in the pipelines from the tank to the engine, pushing fuel towards the engine rather than engine driven pumps sucking fuel from the tanks.
    In case of complete boost pump failure, large transport aeroplanes will be limited by a Maximum Operating Altitude.

 

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