What is the primary purpose of using boost pumps in the fuel system?

The primary purpose of using boost pumps in the fuel system is to provide positive fuel flow to the engine pump. Boost pumps are designed to ensure that there is a sufficient and steady supply of fuel under pressure to the engine-driven fuel pumps. This is crucial, especially during engine start and when fuel demand is high or fuel conditions are less than ideal.

By maintaining adequate pressure and preventing vapor lock, boost pumps help ensure that the engine receives fuel consistently, which is vital for efficient operation and performance. This function is especially important in situations such as low fuel conditions or high altitude, where fuel flow might otherwise be hindered.

The other options—using boost pumps to increase fuel temperature, create additional engine power, or filter the fuel—do not accurately reflect the primary role of boost pumps within the fuel system, as their main function centers around ensuring that fuel is delivered reliably to the engine pumps.