Fuel Injection Systems

After installation of a factory-rebuilt engine, a ground-run was performed. At all settings, the engine ran too rich, and adjustments had no effect. Aircraft was not airworthy. Removed fuel servo from engine, sent out for repair. Reinstalled fuel servo after repair, and engine performed satisfactorily. Returned aircraft to service.

Editorial Staff

Monday, August 12, 2019 at 12:00 AM ET

Verified

Key Takeaways:

Fuel system components, particularly servos and injectors, are susceptible to various failures including improper fuel mixture, physical damage during maintenance, or dislodged parts.
Contamination (dirt, FOD) is a recurring cause of fuel injector issues, sometimes linked to recent engine monitor installations or other maintenance.
These fuel system malfunctions can lead to critical operational problems, ranging from rough-running engines and precautionary landings to total engine failure and aircraft loss.