What could a malfunctioning fuel filter lead to?

A malfunctioning fuel filter can lead to fuel flow issues because its primary function is to remove impurities and contaminants from the fuel before it reaches the engine or APU. If the fuel filter becomes clogged or defective, it may not effectively filter out these particles, leading to a restriction in fuel flow. This can result in inadequate fuel supply to the engine, causing performance problems such as reduced power, difficulty starting the unit, or even operational failure of the APU. Therefore, maintaining a properly functioning fuel filter is crucial for ensuring consistent fuel delivery and overall reliability of the APU.