This Architectural Drawing is AutoCAD, 2d drawing of Water tanker and diesel motor pump Details in AutoCAD, dwg file. The working principle of the diesel water pump is: the water is filled in the pump casing before the pump starts (or there is water in the pump casing). After the start, the impeller rotates at a high speed to make the water in the impeller channel flow toward the volute. For more details and information download the drawing file.