For what purpose are fuel-boost pumps primarily operated?

Fuel-boost pumps are primarily operated to ensure a consistent and reliable flow of fuel to the engine. Their main function is to maintain adequate pressure in the fuel system, particularly during critical phases of flight, such as starting the engine or when operating at low fuel levels. By supplying fuel at the required pressure, boost pumps play a vital role in preventing issues like vapor lock and ensuring that the engine receives the fuel it needs for efficient operation.

This function is crucial because, without a stable and positive flow of fuel, the engine could experience performance issues or even failure, which can be especially dangerous during flight. The operation of the boost pumps creates a positive flow that enhances the overall reliability and safety of the fuel system.