My jet pump which sucks water out of my pond for the sprinkler system turns its self off as soon as I swtich it on. It is not tripping the fuse, the pump itself is just turning off. Is the pump shot? Do i need a new one? It is wired in directly and we have not chagned anyhting to the wiring when it was working ( no extension cords)
It may be tripping the motors internal breaker.
The start switch may not be working or the capacitor may be bad.
You might want to see if you can rotate the motor shaft, to see if the impeller will turn.
If it does not turn then you could have a bad bearing, or trash in the pump.
Theory only works perfect in a vacuum.