Have a 3/4hp pump 90' down in farm country 6 years.
It pumped water 24 hours on ground to flush out when new.
Pump pumps water around 10 min and quits pumpin' water.
Turn off circuit breaker for 15 min the it pumps another 10 min.
Just so I could watch it I have put a tee in line to go outside house that don't go to tank.
Turned valve off at tee to tank and opened valve to go outside.
There is not back pressure or blockage in line
The water is cold and clear.
I did this quit a few times between cutting grass.