Hi Mark.
The pressure tanks have air in the top to provide the pressure.
On ones that don't have a diaphram, the air bubble slowly is
absorbed into the water and disappears. So you need to let more
air into it every so often.
I don't know which valves to turn to let air in, we have a gravity system.
If you have the diaphram kind, the diaphram can leak and cause
the same problem.
You shouldn't be getting pressure directly from the pump, its
only supposed to fill the tank not pressurize the system.
Eric
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