Abstract: A heating device operating with liquid fuel in the single-line mode includes a fuel pump which draws fuel from a supply tank and delivers it into a pressure line region communicating with an atomiser nozzle opening into a combustion chamber, wherein excess fuel is returned from the pressure region to the suction side of the fuel pump by way of a pressure regulator, a return line and a bypass line. Arranged between the return line and the bypass line is a venting apparatus including an actuating element which is reciprocable between an operating position and a venting position and which in the operating position connects the return line to the bypass line to reliably seal the medium in the lines towards the exterior and in the venting position connects the return line to the exterior of the heating device and in that case closes the bypass line.

Abstract: A heating device operating with liquid fuel in the single-line mode includes a fuel pump which draws fuel from a supply tank and delivers it into a pressure line region communicating with an atomiser nozzle opening into a combustion chamber, wherein excess fuel is returned from the pressure region to the suction side of the fuel pump by way of a pressure regulator, a return line and a bypass line. Arranged between the return line and the bypass line is a venting apparatus including an actuating element which is reciprocable between an operating position and a venting position and which in the operating position connects the return line to the bypass line to reliably seal the medium in the lines towards the exterior and in the venting position connects the return line to the exterior of the heating device and in that case closes the bypass line.

Abstract: In a heating device operated with liquid fuel, comprising a fuel pump (1) which includes a displacer member (2) and serves to suck the liquid fuel out of a tank (6) and feed it to a pressure conduit region (7, 9) in which an increased pressure defined by a pressure regulator (14) prevails and which further passes the fuel to an atomizer nozzle (10) from which it passes into a combustion chamber to form a burner flame (11), to avoid interruptions in operation it is provided that the pressure conduit region (7, 9) includes at least one additional volume (20, 22; 24, 26), the size of which is so selected that the pressure drop occurring in the pressure conduit region (7, 9) when gas bubbles are sucked in does not lead to an ongoing interruption in the fuel delivery by the fuel pump (1).