A drip gauge is primarily used to measure?

A drip gauge is primarily designed to measure the amount of fuel in the tank. This instrument directly indicates fuel levels, providing a visual representation of how much fuel is available for consumption. It helps pilots and ground crew monitor fuel levels to ensure that there is sufficient fuel for a flight and to prevent running out during operation. Additionally, understanding the fuel level is crucial for weight and balance calculations in flight planning.

While system leakage, fuel pump diaphragm leakage, and fuel vapor pressure are important considerations in comprehensive fuel system management, they are not the primary function of a drip gauge. Each of these other elements involves different measurement techniques or instruments tailored specifically to assess those conditions. Therefore, the primary role of a drip gauge is focused on quantifying the fuel volume in the tank.