Suntec Oil pump AS47A7432

The Suntec Oil pump AS47A7432 is a fuel pump designed for use with diesel fuel and kerosene in both single-pipe and two-pipe fuel systems. It features a maximum suction lift of 0.45 bar, a filter mesh size of 150 µm, and a strainer open area of 6 cm². The pump has a pressure regulation and shut-off function, with ports for pressure gauge (G⅛"), vacuum gauge (G⅛"), and nozzle outlet (G⅛"), while the inlet and return connections are G¼". It can be mounted via hub or flange, has a cylindrical thread, and is available in versions 5 and 6 with cone seals. The bypass plug is removable with a 4 mm hex key, and the shaft diameter is 8 mm. The pump weighs 1100 g and operates at a fuel temperature of 0 °C, with maximum inlet and outlet pressures of 0.02 mbar and 2 mbar, respectively.

When selecting an oil pump of this type, ensure the mounting type (hub or flange) matches the burner, and the shaft diameter (8 mm) aligns with the coupling. The connection threads must be compatible: cylindrical threads per ISO 228/1, with inlet/return at G¼" and nozzle outlet at G⅛". Check the pressure gauge and vacuum gauge port sizes (G⅛") and confirm the pump's pressure range suits the system. For single-pipe systems, remove the bypass plug using a 4 mm hex key; for two-pipe systems, keep it installed. Also verify the fuel type (diesel or kerosene) and that the pump's maximum suction lift (0.45 bar) is adequate for the installation.

Common failures in oil pumps of this kind include loss of pressure regulation, leading to unstable burner operation or flame pulsation. A clogged filter (mesh size 150 µm) can cause reduced fuel flow, resulting in ignition failure or low flame. Leaks at connections may occur if seals are worn, especially in versions with cone seals. If the shut-off function fails, fuel may continue to flow after burner shutdown, causing flooding or sooting. Check the bypass plug for correct configuration (single-pipe vs. two-pipe) and inspect the shaft for wear or damage that could affect coupling.