How does the new CFF21 flange control differ from the old pilot valve assembly?

The new CFF21 flange control incorporates a float that floats on fuel, which is a crucial innovation compared to the old pilot valve assembly. This design allows for a more accurate measurement of fuel levels within the system by utilizing the buoyancy of the float in the fuel. This mechanism enhances the reliability and responsiveness of the system, ensuring that fuel levels are monitored effectively and that the control can react appropriately to changing conditions.

In contrast, other options do not highlight this critical feature that sets the new design apart. The presence of two supply lines, the use of an external float, or the absence of a Y strainer, while potentially relevant to different aspects of system configurations or maintenance, do not specifically denote the innovative float mechanism that is integral to the functionality of the CFF21 flange control. Focusing on how the float operates within the fuel itself clarifies why this advancement in design is significant for the proper management of fuel systems.