Often when the precharge becomes low it's not simply a matter of needing to add air - it's a failure in the bladder or diaphragm. While I don't think it's to blame in this problem, I'd also suggest rechecking your tank pre-charge to see if it has stayed at 38 PSI or started to fall again. Or you might have a recently soggy spot in the yard if it's after the pipe leaves the well. If you can go and listen at the top of the well while someone else turns the pump on, you might actually hear this leak, if its in the well above waterline. ![]() The third possibility - you have a leak in the pipe above the pump and check valve - so the pressure is limited, and the water drains away from the leak without the check valve being to blame. When you only had 10 PSI in the tank, there should have been some water storage - when raised to 38, no water could possibly make it into the tank, since that's designed for 40/60 PSI operation and won't take any water until the the water is over 38 PSI. To zero - unless you are using water, the pressure should stay at 27 if it was pumped up to 27.
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