I have a new k2 3/4 hp pump which replaced a red lion 3/4. The old pump was running great no sputtering or other issues until a cold spell (6 days at 10 deg.) The old pump lost prime for some reason and binded. I replaced it with a new one and now I'm getting air in the lines. It's holding prime but it takes quite a while to reach cut off which I lowered to 40psi. I'm wondering if I have small suction leak or a dry well.