I found my filler hose actually started to get dry rot cracks , the fumes were coming from that. It was a little tricky to replace, not much room to get hands in. Solved my fume issue.
Mike Bowersox here in central pa, I have a 1997 nitro. Transomtalk looks like a good place to get help with problems that have started to pop up. I fish rays town when I get the time.