What component needs to be monitored to ensure proper fuel circulation in the system?

Monitoring fuel flow sensors is essential for ensuring proper fuel circulation within the system. These sensors provide real-time data on the rate of fuel flowing into the engines and throughout the fuel system. By assessing this information, the flight crew can confirm that the fuel is being delivered efficiently and at the correct flow rates necessary for optimal engine performance. This is critical, as inadequate fuel flow could lead to engine inefficiency, power loss, or in severe cases, engine shutdown.

The other components listed, while they have their own important roles within the fuel system, do not directly indicate the flow rate of fuel. Pressure differential gauges measure the difference in fuel pressure between various points in the system, helping to identify blockages or malfunctions but not the overall flow rate. Over-pressure burst disks are safety devices designed to release fuel in cases of excessive pressure; they do not provide ongoing monitoring of fuel circulation. Fuel temperature sensors measure the temperature of the fuel, which is important for ensuring it is within operational limits, but they do not provide insights into how well fuel is circulating. Thus, fuel flow sensors are the key component specifically tasked with monitoring proper fuel circulation.