First post.

I have a shallow well pump hooked to a 20 gallon pressure tank. Before I installed the 20 gal tank, the pump went without a pressure tank for a few months, due to a burst bladder in the old tank.

I have the pressure switch set to 40/20 and the pump will build to pressure and shut off, but it takes forever. 10-15 minutes. When it shuts off, it will hold the pressure until I open a faucet, so I don't think it is leaking.

When I call for water, it seems fine unless I open more than one faucet (or toilet or washer, etc) and the pump is running. Then my pressure is horrible.

Any ideas?