I had problems with air locks that were cured when I replaced the
water pump">raw
water pump. That was two year ago and guess what? The new
pump has started to develop the same symptoms as the first pump. Twice in the last month I have had to rev the
motor to get water flowing. If this progresses like the first pump, by next year revving will not be enough and only bleeding out the air will
work. Only closing the water inlet to the
motor while sailing kept the problem from occuring once the original pump was several years old. (Maybe I should just always sail without heeling more than 20 degrees. Then air won't enter the inlet line.)