A fuel line for use in a fuel-carrying vehicle designed as a one-piece multi-chamber line having at least two separate fuel-carrying lines each forming a chamber. A first chamber carries fuel in a first flow direction and a second chamber carries fuel in the first or a second flow direction. Also proposed is a correspondingly adapted connection piece for joining to such a multi-chamber line.

The present application is directed to a fluid transfer assembly including: a fluid line including a hydrogen-based fluid stream; and a Venturi lubricant injector fluidly connected to the fluid line and adapted to inject lubricant into the hydrogen-based fluid stream within the fluid line.