Which component houses the defuel pump for the type 3 system?

In a type 3 fueling system, the defuel pump is specifically located within the hydrant servicing vehicle. This vehicle is designed for various fueling operations, including defueling, making it essential in a type 3 system setup.

The hydrant servicing vehicle is equipped to manage the transfer of fuel and typically includes various pumps and valves necessary for efficient operation. Having the defuel pump housed in this vehicle allows for mobility, enabling it to move to different hydrant locations as needed.

Although the other options may relate to aspects of fueling systems, they do not serve the function needed for housing the defuel pump. The pumphouse generally contains stationary pumps for fuel distribution, while the lateral control pit and hydrant outlet pit are used for other components in the fueling infrastructure, but they are not designed specifically for housing the defuel pump. The design and purpose of the hydrant servicing vehicle, therefore, make it the correct location for this component within a type 3 system.