What is the primary function of a fuel pump?

The primary function of a fuel pump is to move fuel from the tanks to the engine. This is crucial for the operation of any internal combustion engine, as it ensures a steady and reliable supply of fuel needed for combustion. The fuel pump pressurizes the fuel and delivers it through fuel lines to the engine's fuel injectors or carburetor, depending on the engine design. Without a functioning fuel pump, the engine would be unable to receive the necessary fuel to operate effectively, leading to performance issues or complete engine failure.

This fundamental role of the fuel pump in maintaining fuel delivery directly impacts engine performance, efficiency, and reliability, making it an essential component of aviation fuel systems. Other options either serve different functions, such as electrical systems or fuel measurement, or are related activities like filtering that do not reflect the primary responsibility of the fuel pump itself.