Is it possable for a motor to pump water if the impeller is put in wrong. Changed water pump impeller and went for a ride and motor runs good at idle and has a strong stream from pee hole but when running up on plane it runs for a while and them the stream becomes a trickle and buzzer comes on. Pee hole is clear
The impeller either pumps or it doesn't or not enough. It usually does not change output once running then goes back to pumping as it should.
You may have an aeration problem, leaking seal or o-ring, or a powerhead problem. Start at the pump and work your way up the engine. Monitor the water pressure as you run the boat.