Which of the following are the two main fuel delivery methods for carburetors?

The two main fuel delivery methods for carburetors are gravity feed systems and pressure feed systems.

In gravity feed systems, fuel is supplied to the carburetor by being drawn from a fuel tank that is positioned above the carburetor. The force of gravity allows the fuel to flow down through the lines to the carburetor, where it can then be mixed with air for combustion. This method is simple and relies on the natural force of gravity, making it widely used in small engines.

Pressure feed systems, on the other hand, utilize a fuel pump to create pressure that pushes fuel into the carburetor. This method is often used in applications where the fuel tank is located below the carburetor, ensuring that fuel is delivered reliably even when the tank is at a lower elevation. This type of system can provide more consistent fuel delivery and is suitable for engines requiring higher performance.

Understanding these two methods is essential for troubleshooting and servicing small engines correctly, as they dictate how fuel is delivered to the engine for optimal performance. Options involving evaporative systems or electrical and mechanical delivery do not describe the primary delivery mechanisms of carburetors, as they focus on different technologies or systems not specifically used in traditional carburetor designs.