Thanks all for the input. I am going to have the local Mercrusier mechanic pull the boat and check the bellows. I could probably handle the mechanical side if a) I had the time and if I had the time Best to leave it to experts to be sure it gets done correctly. There is nothing screwed in or attached otherwise that can cause a leak and since it is stationary and bilging once per hour, the diagnosis seems on target. I never had the bellows checked/repaired/replaced and am the original owner. I did have a block replaced a few years back (bad winterization job by a local storage facility) and carb rebuilt last year but other than that...nothing. Appreciate the help! Wayne - Lake Redstone (LaValle, WI).