the present invention relates to a feed pump , in particular for pumping uv paints and other high - viscosity media , with a pump housing to which an inlet valve and an outlet valve are fitted , and a piston , which for pumping a medium is mounted in the pump housing in a manner as to permit positional shifting . to improve the seal and the piston lifetime , the piston is guided in at least one section of the pump housing by way of at least two seals positioned one behind the other in the axial direction of the piston so as to seal it from its surroundings and forming between them an intermediate gapped space that connects to the flow from a coolant and / or lubricant container .