1. Blockage of water inlet: If the water inlet is blocked by debris or sediment, the water pump will not be able to absorb water. At this time, the inlet should be cleaned to remove debris or sediment, and if necessary, the inlet pipe should be replaced or a filter screen should be installed.
2. Damage to water pump impeller: Damage to the water pump impeller can affect its water absorption capacity. Check for cracks or deformation in the impeller, and replace it promptly if damaged.
3. Poor sealing: Poor sealing can cause air leakage, affecting the water pump's suction efficiency. Check if the sealing structure is intact, and replace the sealing components in a timely manner if there is any damage.
4. Prolonged storage time: Water pumps that are not used for a long time may experience oxidation and corrosion inside, leading to component damage. Cleaning and maintenance should be carried out, and a trial run should be conducted to remove the internal oxide layer.
5. Unsealing pipeline: Leakage of the pipeline can cause the water pump to not self suction. The sealing degree should be increased at the junction of the inlet pipe and the water pump to eliminate the phenomenon of pipeline leakage.
6. Failure to add guide water: Failure to add guide water before the water pump starts working will result in the inability to pump water. It is necessary to fill the water intake before pumping water.
7. Excessive suction or long suction pipeline: Lowering the suction or shortening the pipeline can solve the problem of excessive suction.
8. Low voltage: Adjust the voltage of the diesel engine self-priming pump to solve the problem caused by low voltage.
9. Inverted inlet and outlet: Inverted inlet and outlet during installation can cause non self suction and require reinstallation.
10. Leakage in pump casing: Check the pump casing and block the leakage point.
11. Reverse wiring of three-phase motor: Swapping two phases can solve the problem caused by reverse wiring.
12. Blockage of reflux hole: Check and clean the blockage of reflux hole.
13. Insufficient fluid storage in the pump body: Ensure sufficient fluid storage in the pump body.
