A differential pressure gauge installed on a fuel system measures the difference between which pressures?

In a fuel system, a differential pressure gauge is designed to measure the difference in pressure between two points, allowing for the assessment of flow and potential blockages or restrictions within the system. The correct answer identifies the measurement between high pressure and outlet low pressure.

When the gauge measures high pressure (typically measured at the inlet or upstream point) and outlet low pressure (measured downstream), it provides critical information about the system's performance. A higher differential pressure reading indicates that there may be an obstruction or restriction in the flow path, as the pump is working harder to push fuel through the system. Conversely, a lower differential pressure might suggest that the system is operating efficiently with minimal resistance.

This concept is essential for maintaining optimal fuel system performance, as understanding the pressure differential helps in diagnosing potential issues and ensuring that the system functions correctly. Proper monitoring of these pressures can prevent equipment malfunctions, enhance operational efficiency, and prolong the life of the fuel system components.