How does a gravity feed fuel system operate?

In a gravity feed fuel system, the fundamental principle at work is the movement of fuel from the fuel tank to the engine due to the force of gravity. This system does not require any mechanical or electric pumps, which distinguishes it from other fuel delivery systems. The fuel tank is typically located at a higher elevation than the engine, allowing gravity to drive the fuel downward through fuel lines directly to the engine.

This method is often used in smaller aircraft where the simplicity and reliability of gravity feed can be advantageous, especially in situations like engine failures, where the absence of pumps could avoid potential fuel starvation issues. The design minimizes complications and potential fuel system failures by relying on this natural force, and generally requires fewer components than systems involving pressurization or circulation.

Other options imply the use of pumps or complex systems that are not a part of a gravity feed setup, which is why they do not apply to this specific type of fuel system.