In a turbine engine fuel system, the high-pressure filter is installed between which two components?

• A. Between the fuel tank and the pump
• B. Between the fuel pump and the fuel control
• C. Between the control and the injector
• D. In the return line

Answer: (B)

The high-pressure path needs clean, filtered fuel right before it reaches the metering and injection stages. Placing the high-pressure filter between the fuel pump and the fuel control ensures particulates and any entrained water are removed before the fuel enters the metering valve and injectors, protecting precise metering and preventing wear or sticking of control components. If filtration were after the control or in the return line, contaminants could reach the control or injectors, leading to erratic fuel flow and degraded performance. Filtering at this point also helps keep the pump and control valve operating on clean fluid, improving reliability.