Where is the control tubing rerouted when the water drain valve is removed from the filter separator?

The correct answer indicates that when the water drain valve is removed from the filter separator, the control tubing is plugged off. This approach is taken to ensure that the system remains sealed and operational without allowing unfiltered or untreated water into the fuel system after the drain valve's removal.

Plugging off the control tubing minimizes the risk of contamination and maintains the integrity of the fuel system. If the control tubing were left open or rerouted to another part of the system, it could lead to potential issues such as fuel contamination or operational glitches in the filtration process. By choosing to plug it off, the design ensures safety and efficiency, keeping the separation process intact without compromising the system.

In contrast, rerouting the tubing to different locations in the system could introduce points of failure or contamination, which would be undesirable in maintenance practices. Therefore, the choice to plug the tubing off aligns with sound maintenance principles, safeguarding the water and fuel system's functionality.