Why must the distance between the fuel bladders and the BPU not exceed 100 feet?

The correct answer indicates that the on-board fuel transfer pump does not generate enough negative pressure. The reason this is critical is that fuel transfer pumps rely on creating a pressure differential to draw fuel from the bladders into the engine or system. If the distance between the fuel bladders and the pump exceeds 100 feet, the resistance in the fuel lines becomes too significant for the pump to effectively create the negative pressure needed to draw the fuel. This can result in inadequate fuel supply, which could lead to performance issues or complete failures in operation.

Understanding the limitations of fuel pump design and operation is essential, particularly in applications where distance and resistance can greatly impact performance. This context reinforces the importance of maintaining a short distance to ensure the system operates efficiently and effectively.