My pool pump has always been on a timer but now when it run for very long looses prime Why or what can I do to fix this problem?

* Air leak in the suction line. Check all of the connections in the suction line, including the pump lid, and make sure they are tight. If there is an air leak, it will prevent the pump from drawing water properly, and the pump will lose prime.

* Clogged suction line. The suction line can become clogged with debris, such as leaves, twigs, and dirt. If the suction line is clogged, it will restrict the flow of water to the pump, and the pump will lose prime.

* Faulty pump impeller. The pump impeller is the part of the pump that rotates and creates suction. If the impeller is damaged or worn out, it will not be able to create enough suction, and the pump will lose prime.

* Low water level. If the water level in the pool is too low, the pump will not be able to draw water properly, and it will lose prime.

To fix the problem, you will need to identify the cause of the loss of prime and then take the appropriate steps to correct it. If you are unable to identify the cause of the problem yourself, you may need to call a pool professional to help you.