Hello, My well is about 100ft deep and I have a submersible hp pump that was installed around 1980. About 8 years ago I had it out and installed a check valve. It has been taking about 10 minutes for it to go from 30 to 50 psi before it shuts off and if I have a sprinkler running it never shuts off.I am ready to replace it and not sure where or what to buy. It is a 2 wire but should I install something bigger like maybe a 3/4 ? I want to get a pump before I pull it????? Thanks.