Brand new 260 SCR. Turned on the water pump breaker the other day to use the transom shower. While the shower worked water was also pumping out from a discharge at the rear. Once I turned off the shower the water pump stayed on and water continued to pump out of a rear discharge. The only thing I did different was remove the water fill cap and fill the tank. This is the first time this happened. My theory is the pump is not priming correctly. Am I correct and are there any suggestions?