I am new to this forum.Want to start by saying hi to everyone.I just acquired a 1992 mercury 90 hp two stroke.And Im kinda lost with this.Motor runs good,But rich which is better then lean.I rebuilt the carbs and fuel pump last week just to make sure I knew that the boat was getting the correct fuel,So I didn't end up with a new old burnt up motor.Not knowing any history on this.Now I having a starting point.On the top of the crank casing it has a nipple with a little hose that runs down to a nipple on the bottom of the crank casing.The hose keeps blowing of the bottom nipple,while the hose was off I notice there was fuel spitting out of it.So I replaced it with another clear hose.Is there suppose to be gas coming from there.If I run it with the hose connected it smokes and runs a little rougher.after running it with the hose hook up.And shut the motor off,disconnect the hose, fuel leaks out for a couple seconds.Then when I start it back up it smokes less and runs smoother.I think the nipples are something to do with crank pressure but I'm not sure.If so why would there be fuel getting into the crank case, is this a sign of something wrong,maybe a head gasket.I have no clue.Any information would be appreciated.