Galvanized Air Over Water Tank Short Cycle

[Hysteresis]

I have an air over water galvanized tank for my well at my house. Lately has been short cycling. When I shut off the pump, and try to drain nothing comes out, pressure dial indicates zero immediately. When I close the drain and turn the pump on, immediately jumps to 60 PSI and short cycles. If I leave the drain open, it does not short cycle but runs continuously, pumping water out the drain, at about 50 PSI.
All the other posts I've read here indicate that draining should solve the problem with this old style of galvanized tank, but my experience has been different. Any advice as to how to solve the short cycling would be much appreciated.

 

[Valveman]

The tank is completely full of water. It is like holding your finger over a straw full of ice tea. The water can't drain out until you let some air in. With the pump off and faucets open. attach an air compressor to the Schrader valve on the inlet side of the tank. Blow out all the water, close the faucets, and turn the pump back on.

 

[Sponsor]

 

[Hysteresis]

Thanks for the reply. Unfortunately I do not have a schrader valve on my tank. I'll post a photo if I can.

 

[Hysteresis]

 

[Hysteresis]

 

[Hysteresis]

 

[LLigetfa]

All the other posts I've read here indicate that draining should solve the problem with this old style of galvanized tank, but my experience has been different.

Draining it would have solved the problem for a while if you had actually drained it but as Cary said, you need to let/put air into it for it to drain.

For a longer term fix you need to fix/replace the AVC/air maker that is supposed to add air automatically.

 

[Hysteresis]

Thanks so much for the help.
1. I didn't realize that was a schrader valve, just had some kind of cap on it.
2. Emptied successfully, no more short cycling.
3. Ordered a new AVC, should arrive tomorrow.
4. I'm so appreciative of everyones help. I hope something good happens to each of you this week. Thank you.