It does sound like there is not enough air in the expansion tank. One
well I worked on, years ago. There was a device with a bit of a
diaphragm. Aparently, it had an air intake valve. Every time the pump
turned on and off, it would inject a tiny bit of air into the
expansion tank. Of course, these fail after a while. And then the tank
gets water filled.

If there is a tire valve at top of the tank, you could pump some air
in, using an air compressor. Might help. I havn't got much experience
with well tank systems.

--
Christopher A. Young
Learn more about Jesus
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..


"millinghill" wrote in message
...
I measured several times and each time my water pump comes after LESS
than 2gallons are used in the house.

I have:

1hp jet pump
Bladder water tank Amtrol Model CM8003 (32gal, 15"dia, 46"high,
closest similar model specs on their website)
Well water is hard water.

The sweat line on outside of water tank is 1/3 of the way up the tank,
and the upper 2/3 of the tank sounds hollow, so I know there's water/
air in it. Tank specs say air pressure in tank should be 30. I
measured 32 with tire gage, so kinda close. Pressure switch turns on
at 28psi, instantly jumps to 40 where it stays for about 10sec,
quickly rises (in less than 5sec) to 58 , then shuts off and instantly
drops to 50.

I'm guessing maybe the stub to the water tank might be mostly clogged
and that the tank is not acting like the reservoir it should be???
Opinions appreciated.

Thanks!
Theodore