No Pressure from well pump

A friend has a 120 foot deep well with pump in the well and a pressure tank in his basement. Now he has water but very little pressure. Could this be a filter clogged with sand or is the pump going south? Pump has been in place for about 4 years.
ANy ideas?
Thanks
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butch burton wrote:

Is this no pressure w/ pump running, while not running and on the pressure tank, ...?
Could be any of the above or other such as the tank has an air leak if there's pressure when running but not afterwards.
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