"Bryan Martin" wrote in message
. com...
We have a new house that has a holding tank under it (see
http://www.lowes.com/lowes/lkn?actio...-52&lpage=none).
The line comes strait from the well into a pressure switch then into this
tank from a T joint. Currently their doesn't appear to be any water at
all in this holding tank. How much should be there and what do we need to
do to make it fill some? Should we let some air out of the tank?

How do you know there is no water in the tank? The purpose of the tank is
to hold some water under pressure so the pump does not cycle every time you
turn of a faucet. The tank fills against a bladder when pumping, the
pressure then forces the water out when it is called for. If you let air
out, you will reduce the operating pressure of the system.

What problems are you having? That will determine the cure needed.