Fuel inlet servos were components of the matter/antimatter injector assembly on Galaxy-class starships.

During a brainstorming session in engineering with the senior engineering staff in an attempt to solve a problem with the fuel injectors on the USS Enterprise-D in 2366, Wesley Crusher suggested that the fuel inlet servos might be caught in cycle. Geordi La Forge responded that if the servos were caught in cycle, the swirl dampers would be frozen as well. (TNG: "Hollow Pursuits")