Burner for burning liquid fuel, the burner comprising a container for storing the liquid fuel, an opening allowing filling of liquid fuel through the opening and into the container, and a fire outlet for fire from burning liquid fuel to leave the burner, - the burner also comprising a stopping means (4,10,14) for not allowing, preferably for preventing, filling of liquid fuel through the opening and into the container of the burner, - where the burner comprises an actuator (6,16) for displacing the stopping means (4,10,14) between a first position and a second position, and vice versa, and where the actuator (6,16) is positioned in a part of the burner being heated by fire from burning liquid fuel, - where the actuator (6,16) is provided in a position, in relation to the fire outlet, resulting in the actuator (6,16) changing temperature depending on a temperature of the burner within the vicinity of the opening for filling liquid fuel into the container of the burner, - where change of the temperature of the actuator (6,16), because of change of temperature of the part of the burner being heated by fire from burning liquid fuel, results in change of a geometrical shape of the actuator (6,16), and - the actuator (6,16) and the stopping means (4,10,14) being mutually connected for the actuator displacing the stopping means (4,10,14) when a change of geometrical shape of the actuator occurs, - where change of the geometrical shape of the actuator (6,16) results in displacement of the stopping means (4,10,14), via the connection, between the first position and the second position, towards the first position or towards the second position, and - where the stopping means (4,10,14) is displaced towards the first position, when the temperature of the actuator (6,16) is changed from a relatively high temperature to a relatively low temperature, and in which first position the stopping means (4,10,14) is allowing liquid fuel to be filled into the container of the burner, and - where the stopping means (4,10,14) is displaced towards the second position, when the temperature of the actuator (6,16) is changed from a relatively low temperature to a relatively high temperature, and in which second position the stopping means (4,10,14) is not allowing liquid fuel being filled into the container of the burner. - the burner also comprising a stopping means (4,10,14) for not allowing, preferably for preventing, filling of liquid fuel through the opening and into the container of the burner, - where the burner comprises an actuator (6,16) for displacing the stopping means (4,10,14) between a first position and a second position, and vice versa, and where the actuator (6,16) is positioned in a part of the burner being heated by fire from burning liquid fuel, - where the actuator (6,16) is provided in a position, in relation to the fire outlet, resulting in the actuator (6,16) changing temperature depending on a temperature of the burner within the vicinity of the opening for filling liquid fuel into the container of the burner, - where change of the temperature of the actuator (6,16), because of change of temperature of the part of the burner being heated by fire from burning liquid fuel, results in change of a geometrical shape of the actuator (6,16), and - the actuator (6,16) and the stopping means (4,10,14) being mutually connected for the actuator displacing the stopping means (4,10,14) when a change of geometrical shape of the actuator occurs, - where change of the geometrical shape of the actuator (6,16) results in displacement of the stopping means (4,10,14), via the connection, between the first position and the second position, towards the first position or towards the second position, and - where the stopping means (4,10,14) is displaced towards the first position, when the temperature of the actuator (6,16) is changed from a relatively high temperature to a relatively low temperature, and in which first position the stopping means (4,10,14) is allowing liquid fuel to be filled into the container of the burner, and - where the stopping means (4,10,14) is displaced towards the second position, when the temperature of the actuator (6,16) is changed from a relatively low temperature to a relatively high temperature, and in which second position the stopping means (4,10,14) is not allowing liquid fuel being filled into the container of the burner.