GASEOUS FUEL SUPPLY SYSTEM TO A CLEAN COMBUSTION ENGINE

A gaseous fuel supply system for a clean combustion engine configured to receive gaseous fuel at a changeable demanded injection pressure being above a predetermined minimum required injection pressure and below a predetermined maximum required injection pressure. The supply system comprises a control unit configured to control supply of pressurized gaseous fuel from a first gaseous fuel tank arrangement to the clean combustion engine using second supply line, and control a compressor such that the gaseous fuel in a buffer tank is pressurized to at least the current demanded injection pressure, in response the pressure of the gaseous fuel in the first gaseous fuel tank arrangement is below current demanded injection pressure or predetermined first threshold value; and to subsequently, in response to a sudden increase in the demanded injection pressure, control supply of pressurized gaseous fuel from second gaseous fuel tank arrangement to buffer tank using third supply line.