A fuel ship was a spacecraft dedicated to the purpose as transport vessel to bring fuel for other starships and space vessels. Fuel ships with dedicated tanks for liquid or compressed fuel were tankers, referred to as fuel tankers.
History and specifications[]
Federation spaceships in Starfleet service in the 2260s decade were sometimes assigned on missions where their destinations required rendezvous with fuel ships assigned to be available for their journeys. (Star Trek Game)
In the 24th century, the Torkezzi civilization operated a fuel ship near the Vaughn-Creighton system. In the 2370s, the Torkezzi fuel ship also transferred other container cargo between various stops. In the year 2371, the Torkezzi fuel ship took on cargo from a container ship and offloaded it to an asteroid breaker vessel. (TNG - Day of Honor novel: Ancient Blood)