After three years, the water
pump on my Nextgen 3.5 KW generator
has started to consistently losing its prime when I start it up. In the previous three years, I have not had this problem.
The problem occurs if I do not immediately shut off the seacock to the generator
when I shut it off. The next time I start it, I must manually put water
in the hose leading to the pump. Because things work fine after that, it means that there is not an obstruction. The strainer is empty of debris. Lastly, the gasket
between the impeller and the cover is good. There is a siphon break downstream of the pump.
The system has a seacock, some tubing, the strainer at the waterline, to the water pump. The total lift
is about 2 feet above the waterline which is between the seacock and the strainer. The run between the strainer and the pump is almost level. No recent modifications have been made that might cause the problem to have arisen.
Since the problem has arisen, I have changed the impeller with a new Globe. The problem remains.
Any help would be appreciated.