Yamaha 150's Water Pumps?

[CapeBoater1]

I started my Grady with twin Yamaha 150 2 strokes today. They started fine and sounded great. Only thing was there was no water coming out from the water pump jets. I believe it is because there is not enough pressure from the ear muffs or whatever it's called, to feed the pump and get a stream of water. Question is am I right or should I be concerned? The water pumps were replaced in Spring of 2005 and boat was hardly used. I purchased it in the fall.