I have a yard frost free Hydrant next to my well cap. This is a 1 year old home. Last year the hydrant had all kinds of flow. This spring I went to turn it on and I barely have anything come out of it and no pressure. I have adjusted up and down on the rod that connects to the plunger. I do not have a check valve between it and the pressure tank. I was experimenting the other day, I can turn a faucet on inside the house and only then will my hydrant resume to have good pressure and flow. I hope I'm missing something simple. Any help would be appreciated.