Low-pressure pump (2) for providing bubble-free liquefied gas (1), comprising a compressor unit (4), that can be connected to a storage container (3) for the gas (1), for increasing the pressure of the gas (1), wherein a pressure-tight buffer container (5) is arranged on the outlet side of the compressor unit (4), wherein the buffer container (5) has, in that region (52) toward which gas bubbles (1c) contained in the liquid phase (1a) of the gas (1) travel owing to their buoyancy (53) in this liquid phase (1a), an outlet (55) that can be closed by a valve arrangement (54), wherein the valve arrangement (54) is designed to close automatically at least when the level (1d) of the liquid phase (1a) of the gas (1) in the buffer container (5) exceeds a predefined height (56). Associated system (9) for providing bubble-free liquefied gas (1) at high pressure PH, and injection or injector system (10) for an internal combustion engine (8) operated using liquefied natural gas (1).