I hope someone can help me. I have a 1986 34 #253. I recently changed the impeller and now everytime I sail or Motor sail for some reason the hose from the thru hull to the impeller empties its water and does not refill causing overheating. the strange thing is that i can motor all day and never have any poblems. When sailing i am sure i have never heeled over enough to expose the thru hull. has anyone experienced this if so how did you remedy it thanks Billy