Well pump will not pressurize tank unless you reset the power, then it will work fine until the first refill, and pump runs all the time.

Assume from this (unless you reset the power) that you mean reset the switch.

Need a little info such as what type of pump (in the well or above ground) and what pressure the pump gets up to, even when it will not cut off.

Could be the switch. Could be a pump going bad or other pump related issues.