How does a gravity feed fuel system function?

A gravity feed fuel system operates on the principle that fuel naturally moves from a higher elevation to a lower elevation due to the force of gravity. In this system, the fuel tank is positioned above the carburetor or the engine, allowing the fuel to flow downward without the need for pumps or pressure systems. This unobstructed flow ensures a simple and effective means of delivering fuel to the engine.

While other systems may rely on pressure or suction mechanisms to transport fuel, the gravity feed system's reliance on gravitational force is what makes it straightforward and reliable in certain applications, particularly in small engines and certain outdoor power equipment. This simplicity often translates to fewer components, which can reduce maintenance needs and enhance reliability over time.

In contrast, systems that force fuel or use pumps may introduce complexities that a gravity feed system avoids, which is why gravity feed is often favored in specific scenarios where such simplicity is advantageous.