I have a similar situation. Maybe you guys can lend some advice.
Here's a little bit about my system... My pressure switch is a 30/50. I have a 32 gal pressure tank from 1993. The well is 430ft deep, about 175ft from the house and yields about 6 gpm.
Here's what I'm experiencing. The pressure is awful. It works good in the basement, Ok on the first floor and bearly makes it to the 2nd floor. When running the water, the pressure drops from 50 to 30 in about 20-30 seconds and refills back to 50 in about 10 seconds. When not running water, the pressure holds. The pressure of the tank always matches the line pressure.
I shut the pump off, drained the system and the tank pressure was zero. I filled it up to 28 and it held. I refilled everything and drained it down again. The tank pressure was at zero again and it felt like there was still water in the tank. When the system is full, no water comes out of the air valve on the tank. Just air. Now, I've only pressed the valve briefly. Should I hold the needle in for a while to see if I get water out of it? Is it definately my tank? Let me know your thoughts. Thanks.
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