Which two types of pumps are present in the Cessna 172 fuel system?

The Cessna 172 fuel system includes two types of pumps: the engine-driven pump and the electric fuel pump. The engine-driven pump is a mechanical pump that operates continuously while the engine is running, ensuring a steady supply of fuel to the engine. This pump is crucial for maintaining proper fuel delivery during normal operation.

The electric fuel pump serves as a backup and is typically used during engine start and takeoff to ensure adequate fuel flow. It can also provide additional fuel pressure if the engine-driven pump were to fail or have issues. The combination of these two pumps allows for reliable fuel delivery under various operating conditions and enhances the overall safety and efficiency of the fuel system in the Cessna 172.

The other options do not accurately describe the types of pumps in the fuel system; pneumatic and turbine-driven pumps are not used in this context, and neither manual nor hybrid pump types exist in the Cessna 172.