The reason is that there are air or water inlet pipes in the pump body to accumulate gas, or the bottom valve is closed and the water is not filled with dissatisfaction, the vacuum pump filling is severely leaked, and the gate valve or the door is not strictly closed. Removal method: First press the water, then fill the pump body with water, and then boot it. At the same time, check whether the anti -stop valve is tightly, the pipeline and the joints have no air leakage. If the air leakage is found, the lubricant or paint paint is applied to the joint after removing, and the screw is tightened. Check the oil sealing ring of the water pump shaft. If the wear is severely, the new items should be replaced. The pipe is leaking or air. The nuts may not be twisted tightly during installation. If the leakage is not serious, you can apply cement in the place where the air is leaking or leak, or the cement slurry mixed with asphalt oil. Temporary repair can be applied to some wet mud or soft soap. If you leak water at the connector, you can tighten the nut with a wrench. If the leakage is severe, you must re -disassemble and replace the cracks; reduce the tube and press the pump's mouth into the water by 0.5m underwater.