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If you have a union in the suction piping as many well systems do it may be the culprit. some times tightening the union will fix the problem.
Another place air can enter is through the pump seal,if it is worn it may allow air to be pulled into the pump when it is running. replacing the seal can sometimes fix the problem. If you are losing the prime on your well system the problem is between the check valve and the well,if not the problem is between the check valve and the pump.

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2007-07-31 02:48:29
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Q: What causes air to get into your well water if a check valve is working as it should?
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