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This could possibly be, you have some water from condensation buildup inside the tank, liquid does not compress. Before this next step make sure the tank is to 0 psi! Now, there should be a relief valve Wingnut on the bottom. Loosen the wing nut and drain as needed. Then retighten the wingnut (Do not overtighten). Plug the compressor in and try it. My second suggestion is, the psi adjustment pressure knob could be faulty replace as needed!
You could have two problems. The first and most likely is that the pressure tank does not have a high enough pre-charge or the diaphragm has a leak. The pressure tank acts like a shock absorber for the well pump and pressure switch. When the water pressure drops the switch turns the well pump on. The pump runs until the pressure switch stops the pump. As the water pressure builds it pushes up on the diaphragm inside the pressure tank. If the pre-charge pressure is too low the system cycles less but the pressure fluctuates more. To fix this, the tank will have a valve on top that looks like a tire air valve. The tank pre-charge should be 30-35 psi. If your pressure switch is working properly, when the pump builds up the pressure about 15-20 psi more, the switch shuts the pump off. The pre-charge above the diaphragm pushes down and forces the water out to the tap.
If the pressure switch is set incorrectly the fluctuation may produce similar results. The pressure switch should be set to deliver adequate pressure and according to the well pumps working limits. Depending on the how far up the water has to be elevated to reach the highest shower head the more pressure is needed. The pressure switch has electrical contacts that could be burned and not releasing to stop the pump correctly. This should be checked by qualified service technician. Electricity and water don't play well together, add in a little carless good intent and you could have worse problems.
Get out the pressure gage and check the pre-charge, add air with a bike pump or a regulated compressor. If water spurts out of the air valve, the diaphragm has a leak. If the pressure is not the problem, call for service. This video has all the info you may need. Components Of Typical Well Water System
Pressure tanks lose their Pre Charge pressure and have to be serviced. The well Pump needs to OFF. The Pressure tank needs to be emptied of water. There should be an air valve on the tank. Check the pressure .If this is a Bladder tank and Water comes out of the air valve- then the bladder is broken and the tank needs to be replaced. The Pre Charge pressure is set to 2 psi Below the cut-in pressure set by the pressure switch. If your system operates at 20-40 psi, The Pre Charge pressure will be 18 psi. Hope this helps.....
I am sorry to say that if the old pump was putting out 40psi then the pressure switch will need the same psi from the new pump. With the psi les then what the computer knows the engine needs it will not allow it to start and run.
There are several causes for this to occur. 1. If it is a 20-40 switch right out of the box it may not be set correctly. I have had this happen. If it builds to 30psi and shuts right off without straining to build to 40psi adjust the Cut-Out pressure up to 40psi. There are two different adjustments on a well switch. One for Cut In / Cut Out psi and one for Cut Out psi. 2. Lack of head pressure being built by the pump can be the cause. This can be attributed to the wrong Jetting in the pump. IE: A shallow well jet/venturi on a deep well. 3. The pump may have a bad impeller, but the pump will generally really strain to build pressure and a bad impeller will be loud, like grinding at times. 4. Double check the pre-set pressure in bladder tank also. RJ
Continuos pumping is associated with waterlogged pressurized system. To correct it, do this steps. 1. Put the power line off. 2. Drain all the water inside the pressure tank by taking off the plug at the bottom. Then replace and close the drain plug. 3. Open the priming port plug and fill it full with water. Replace the priming port plug. 4. Close the flow control valve to regulate water output 5. Put the power back on, and start the pump. 6, Slowly open the flow control valve until the water stabilizes at 20 or 30 psi at the pressure gage.. 7. Set the pressure switch to stop at 40 psi and start at 20 or 30 psi. This will solve your problem.
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