[wiswind]

I would not think that your rings are bad.....I just mentioned that raw fuel sitting in the cylinders will leak down past the rings into the crankcase.

I do not know how to check for exhaust back pressure, or know what the specifications are. Fuel leaking out around the joint.....just is not normal...I would expect it to drip on down. You pretty much have my head spinning on this one.

You are smart to not let the motor run when fuel is leaking out that spot......however it limits the troubleshooting process.
I want to tell you to unplug the fuel injectors on at a time to see if unplugging 1 will change things.....but that has the motor running FAR too long.
HOWEVER.......I think that removing each spark plug.....1 at a time and inspecting them.....maybe 1 or 2 are wet and the others are not?.......which would narrow things down a bit.