About a month ago I changed my water pump, I replaced the housing and eveything. Tonight, my wife took the boat out with a friend and SMOKED the impeller. Can I change the impeller only, or will I have to change the housing and plate and all again? I have not taken it apart yet to see the damage, I am just hoping all I will have to change is the impeller and put it back together (as I have a spare impeller but nothing else). Thanks