You can also install a funnel at the inlet and outlet of the self-priming pump to inject water. This method is to make a funnel, insert it into the water injection hole of the pump and inject water into the pump from the funnel. However, it should be noted that sealing measures must be taken when water is not filled.
Fill with water by hand pump or small submersible pump. Some pumps have their own hand pumps, or you can buy or make a small hand pump and install it at the water inlet. When injecting water by hand pump, a gate valve must be installed at the pump outlet. After closing the valve, inject a small amount of water into the water pump to transfer the water. When the hand pump comes out, the pump is full of water and can be started.