Why is a low-pressure filter installed between the supply tanks and the engine fuel system?

• A. To remove water from fuel
• B. To increase fuel pressure
• C. To protect the engine-driven fuel pump and various control devices
• D. To reduce fuel temperature

Answer: (C)

A low‑pressure filter placed between the supply tanks and the engine fuel system serves to protect the engine-driven fuel pump and the fuel metering/control devices from damage due to contaminants in the fuel. Fuel coming from tanks can carry dirt, rust, and other debris that, if it reaches the pump or precision control components, can cause wear, clogging, or inaccurate metering. Filtering at this stage catches those particles while the fuel is still at low pressure, providing a first line of defense before the fuel is boosted and routed to sensitive metering and control elements. This function is not primarily about removing water, increasing pressure, or cooling fuel, which is why the other options don’t fit as well.