Find or get a new O-ring. You'll need it for proper fitting. When I replaced my flame trap for the first time after 87k (should be done every 20k according to Bay13), I too encountered gunk and a crack in the smaller hose. I taped it with a hose bandage, thinking it should be all right, until I started smelling a burnt odor entering the vent whenever I was on idle. Took it to my mechanic, and he replaced it for me for $34.50. It's known as the PCV Vacuum Hose. Can't tell you where it originates exactly, and the difficulty rating of replacing it. I take it isn't much based on the charge by my mechanic, but ask around. Good luck.