A liquid-gas separation unit of a dual-fuel engine is provided. The liquid-gas separation unit includes an exhaust conduit and a separator mounted on the exhaust conduit. The exhaust conduit has a first end and a second end distal to the first end. The first end of the exhaust conduit is coupled to a gaseous fuel supply conduit of the dual-fuel engine for receiving a leaked liquid fuel and a gaseous fuel. The leaked liquid fuel is received from at least one injector of the dual-fuel engine. Further, the separator is adapted to separate the leaked liquid fuel from the gaseous fuel before ejecting the gaseous fuel through the second end of the exhaust conduit.