I think I solved my problem. . . I discovered I had fuel in the bilge, I'm not sure from where; I sucked out the bilge (into a bucket for proper disposal), searched for leaks, and all seems to be good. Not sure where the fuel came from, maybe careless PO, but it brought me to ask another question (or two) - is what I've seen referred to as the shower sump the rectangular "bilge" under the front of the engine? if so, how does this get emptied? I searched but could find no hoses or pump connections. . . is it possible for liquid of any type to get "caught" in spaces where it would take a while to seep into the bilge? it seems as though this is what happened in my case. Does this make sense? As always, thanks for the responses and help. . .