What type of fuel pump delivers more fuel than required by the fuel control unit?

The correct answer is the constant positive displacement pump. This type of pump is designed to deliver a fixed volume of fuel per unit of time, regardless of the pressure conditions in the fuel system. This capability ensures that there is always more fuel available than what the fuel control unit requires during operation, allowing for consistent fuel supply and pressure even as the engine demand changes.

In aviation applications, having a surplus of fuel can be crucial, especially under varying load conditions or during transient states of engine operation. This ensures that the fuel control unit can effectively manage fuel delivery for optimal engine performance and efficiency without running the risk of fuel starvation.

Understanding the implications of fuel delivery is essential in turbine engine operation, as maintaining appropriate fuel flow is critical for performance, efficiency, and safety.