A liquefied gas fuel feeding system for an internal combustion piston engine comprising: a tank configured to store fuel in cryogenic conditions, which when in use comprises a liquid gas space (14.1) having a surface (14.2) and an ullage space (14.3) above the surface (14.2); a fuel supply line arranged to extend from the tank to the internal combustion piston engine, the fuel supply line comprising successively a first line section (16.1) and a second line section 16.2), wherein the first line section (16.1) is configured to receive liquefied gas from the tank, and comprises a liquid fuel pump configured to raise the pressure of liquefied gas to a predetermined first pressure and a gas evaporator configured to evaporate the liquefied gas into gaseous form at the first pressure; and wherein the second line section (16.2) is configured to receive gaseous gas from the gas evaporator, the second line section (16.2) comprising a gas valve unit configured to open or close the flow connection between the gas evaporator and the internal combustion piston engine; the liquefied gas fuel feeding system is provided with a return line extending from the second line section (16.2) to the tank, the return line opening into the ullage space (14.3) of the tank and being provided with a first pressure relief valve configured to open when pressure in the second line section (16.2) exceeds a first set pressure, characterized in that, the liquefied gas fuel feeding system comprises a conduit configured to provide a flow connection between the second line section (16.2) and the ullage space of the tank, and that the conduit is provided with a valve member, the conduit extends from the second line section (16.2), to the return line, to a location between the first pressure relief valve and the tank, which conduit is at least partly parallel to the first pressure relief valve and the valve member is parallel to the first pressure relief valve. a tank configured to store fuel in cryogenic conditions, which when in use comprises a liquid gas space (14.1) having a surface (14.2) and an ullage space (14.3) above the surface (14.2); a fuel supply line arranged to extend from the tank to the internal combustion piston engine, the fuel supply line comprising successively a first line section (16.1) and a second line section 16.2), wherein the first line section (16.1) is configured to receive liquefied gas from the tank, and comprises a liquid fuel pump configured to raise the pressure of liquefied gas to a predetermined first pressure and a gas evaporator configured to evaporate the liquefied gas into gaseous form at the first pressure; and wherein the second line section (16.2) is configured to receive gaseous gas from the gas evaporator, the second line section (16.2) comprising a gas valve unit configured to open or close the flow connection between the gas evaporator and the internal combustion piston engine; the liquefied gas fuel feeding system is provided with a return line extending from the second line section (16.2) to the tank, the return line opening into the ullage space (14.3) of the tank and being provided with a first pressure relief valve configured to open when pressure in the second line section (16.2) exceeds a first set pressure, characterized in that, the liquefied gas fuel feeding system comprises a conduit configured to provide a flow connection between the second line section (16.2) and the ullage space of the tank, and that the conduit is provided with a valve member, the conduit extends from the second line section (16.2), to the return line, to a location between the first pressure relief valve and the tank, which conduit is at least partly parallel to the first pressure relief valve and the valve member is parallel to the first pressure relief valve.