Fuel Pump Problems

Fuel flow was erratic, with a slight fuel leak from pump drains. Inspection revealed debris in servo screens. Teardown report showed drive couplings pitted, blades and liners scored, rotors worn. Debris in servo filter appeared to be pieces of the liner. Replaced both pumps. (The same engine-driven fuel pumps (p/n 200F5002) were installed new at engine overhaul. They were replaced at 372 hours and 389.7 hours. The pumps removed had 776.3 and 794.0 hours.

Key Takeaways:

• Fuel pump defects and failures are a recurring issue across various aircraft types, including Cessna, Diamond, Mooney, and Piper models.
• These failures manifest in diverse ways such as engine power loss, starting and idle issues, and both internal and external fuel leaks.
• Problems are reported across a wide range of pump operating times, from very low hours (e.g., 23 hours) to hundreds of hours, with some instances requiring multiple replacements or specific part number changes.

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