1 Pump the whole immersed in water, otherwise the pump will burn out. 2 Check that there is a small branch nozzle above the water outlet of the pump that is 90 degrees with the outlet pipe. This is the inlet port, just connect it with the hose (random accessory), and the other end of the plastic pipe passes above the water surface Intake with. There is a knob (or some other way) at the end of the tube to adjust the size of the intake air, just by turning it on, it can be pumped from the outlet pipe into the water while the pump is on. Check if it is installed, or if it is loaded but not closed.