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 prone to various failures including internal malfunctions, physical damage during maintenance, and spontaneous part failure.
Contamination, such as dirt or foreign object debris (FOD), is a recurring issue for fuel injectors, leading to engine roughness, power loss, or an unairworthy condition.
These fuel system malfunctions can occur across a range of operational times—from brand new or recently serviced components to those with thousands of hours—and pose significant flight safety risks, potentially contributing to rejected takeoffs, precautionary landings, or accidents.