Reasons for the problem of self priming pumps not pumping water

During daily use, self priming pumps may encounter some common problems. For example, the problem of self priming pumps not pumping water can be caused by many different reasons, so how to deal with these problems is the key. The reasons for the problem of self priming pumps not pumping water generally include the following aspects:
1. First use of self priming pump; The so-called self priming pump means that when the self priming pump is started, it does not need to add water, and its own impeller can achieve it. The larger the sealing gap of the impeller, the lower the height of its self priming. This does not mean that the self priming pump no longer needs to be filled with water. After installing the self priming pump for the first time, it is still necessary to fill with water and utilize the impeller function of the self priming pump to suck up the water.
2. The self priming pump takes a long time to fill with water; The possible reasons for this situation may be: insufficient water supply, loose screws on the inlet and outlet covers of the self priming pump, insufficient sealing of the inlet pipe, and a small suction head of the self priming pump itself (in this case, it may be considered to replace a self priming pump with a larger suction head).
3. The self priming pump is unstable and frequently stops working briefly. In this case, it is recommended to check the physical structure or accessories of the self priming pump for damage, and whether there are any foreign objects inside the self priming pump, such as weeds.
4. The water output of the self priming pump is small; When the self priming pump has water output but the water output is not very large, the first step is to check whether the clearance between the impeller and the casing ring is too large. It can be considered to replace the casing or impeller ring. Secondly, there may be gas accumulation in the water pump, and another possibility is that the water flow channel of the impeller is blocked by foreign objects, and there may be severe wear and tear of the packing.
5. Before starting the self priming pump, it is necessary to check if there is any liquid in the pump body. If there is no liquid, it can easily cause abnormal phenomena such as burning the mechanical shaft seal during air extraction.
When dealing with the problem of no water output from the self priming pump, we need to investigate the causes of the pump problems one by one. Quickly identify the cause of the problem and ensure the normal operation of the self priming pump.