1, self-priming pump suction pipe suction port installed at the end of the valve , the end of the valve can not be normally lifted, the proposed selection of the appropriate foot valve.    2, Since the inlet pipe is too long beyond the self-priming pump self-priming capacity, if the inlet pipe submerged in the water pipe more than 1 meter, it is recommended to shorten the water pipe length to reduce the self-priming distance.    3, the self-priming pump has not sucked the water up, so the end of the outlet pipe no water, some users to understand the situation is not up to the self-priming pump, so the self-priming pump outlet should be installed a ball valve and pressure gauge and Pressure gauge should be installed between the pump outlet and the ball valve to facilitate the observation of the outlet pressure to determine whether the water sucked up.    4, self-priming pump selection error Actual working conditions Head is too high, self-priming pump head can not meet the actual conditions needed, this self-priming pump can not reach the solution can only replace the high-lift self-priming pump.    5, the transport of liquid containing debris particles, as the pipeline or the pump encountered a clogged phenomenon so that the self-priming pump head less than, the proposed selection of self-priming sewage pump sewage more appropriate.    6, the transmission of liquid corrosive, self-priming pump impeller encountered serious corrosion Recommended selection of corrosion-resistant self-priming pump products such as stainless steel self-priming pump or fluoroplastic self-priming pump, or after a long time self-priming pump impeller encounter The wear and tear of the gap between the impeller and the pump cover is also too large to achieve the cause of self-priming pump lift It is recommended to replace the new self-priming pump impeller.     7, the user purchased self-priming pump head and self-equipped motor is wrong, such as: the actual need 2900r / min motor and the user dubbed a 1450r / min motor.    Flow stability method: Self-priming pump for the first time must be filled with a pump body as a guider, suction pipe to be absolutely sealed when the start of the flow instability is normal because the row of air in the exhaust row is stable.    Self-priming pump use order    1 import full open, close the outlet valve      2 filled with irrigation (pay attention to monitoring after the first use)    3 start the pump to the valve opening to 1/3 the size of the pump waiting to empty the air (see the state of the pump to determine whether the air is running)   4 outlet valve fully open normal use    5 is the liquid water, or mud? Mud, the flow head will be reduced. Pump calibration of the head of the water are really for water. Too viscous medium, the impact is relatively large.