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:

• Aircraft fuel pumps, both engine-driven and electric, are prone to various defects, leading to engine power loss, starting difficulties, and fuel leaks across different models (Cessna, Diamond, Mooney, Piper).
• These failures can occur at highly variable operating hours, ranging from very low (23 hours) to hundreds of hours, and sometimes require multiple part replacements or extensive troubleshooting.
• Incidents highlight common issues such as defective new parts, pumps affected by Airworthiness Directives (ADs), and problems referenced in service bulletins.

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