I am currently working in the bilge area of my 2004 Nitro 901. My boat was taking on water. After a full day fishing (not in the rain) when I would unscrew the drain plug, my boat would drain water for 20 minutes. It was taking on so much water that the water was getting into some of my compartments in the front of the boat. I had to remove starter battery and the bilge hatch (which only 4 of the 6 screws came out, the other two had to be pried out) then I could see the 3 pumps. The problem I had was that my on/off valves were cracked (these are the ones controlled from the drivers seat on the right). These little plastic critters cost a mere $60.00 a piece. One of my stainless steel clamps would not unscrew so I had to use a dremel to cut it in half. When I was "gently" pulling my hose off one of the pumps the ribbed outlet broke. When I removed by bilge pump from the base the clips on the base broke. Here is all I am saying, the work will be somewhat time consuming, because you have to basically stand on your head, other unrelated things may break while trying to repair your problem. I ended up buying new hose, new bilge pump, new clamps, new valves, silicone, wire connectors and received a stiff neck that lasted for a week. I guess they use plastic to keep weight and cost down? Good luck!
Kevin