My old pump burned up so i recently replaced it (with a refurbished pump) I have new pipe to the pump, new tank. my pump is a 1/2 hp 230v pump, I also replaced the control box. With my pump plugged in and the water coming straight out of the pipe bypassing the tank when I turn the power on I will get water for a minute or so then I won't get water for a minute. This will keep happening. I have checked the switch and when I quit getting water there is still power going to the pump. any suggestions or ideas? bad wiring or bad pump?...I know that there is water in thew well, the pump is located at 100 ft of a 115 ft well and i can see the water level about 10 ft underground.
A good pump would pump water continuously without being hooked to the tank. You say the power is still going to the pump when it quits but you didn't say if it is getting the proper voltage and you didn't say if the pump is still running but just not pumping. If it's still running then try raising the pump some. If it's not running then I'd suspect the thermal protector switch so you'd need a new pump. Are you sure there's a full 230V going to the pump? Sometimes ants like to get in the electrical pressure switch and get in between one or more of the contacts.
Your problem may be in the wire feeding down to the pump, the pump starts to run, the torque of the motor turning causes the wire to twist and causes the break in the wire to spread and open the circuit. This stops the pump, pump settles back in to position and restarts, seen this happen a lot. Pull the pump and inspect the wire from top to bottom very carefully.
Immediately I would suspect the referbished pump is not working properly. Unfortunately you will have to take it out and test it under the same circumstances you describe, but complete the system so the pump has some pressure to work against. Just running the pump with minimal pressure might not reveal the problem. Under working load the pump might be over heating (just enough to open a bad coil) and cause it to shut down till the coil cooled and made temporary reconnection. Good luck. )
