the invention relates to a pump comprising a housing , comprising at least one pump chamber , comprising an inlet valve that has a valve element which controls an inlet opening , comprising an outlet valve that has a valve element which controls an outlet opening , comprising a pressure relief valve that has a valve element which controls a pressure relief opening and on which a spring element acts in the closing direction , and comprising a spring chamber that receives the spring element . a stop element which can be accessed from the housing outer face and which can be adjusted in the closing direction is arranged in the spring chamber , the spring element end that faces away from the closing direction resting against the stop element .