induction

FE450 2009 somehow breaths fuel inside the airbox. There is also little fuel in motor oil. Any idea where I should start working this problem? Its not a leakage for sure. Thanks for help!

Does the 450 boot have velocity stack inside it? Anyone can post a picture of 450 boot? The reason why I ask is that I'm installing custom 46mm throttle body into my 570, but I can't seem to fit the boot back even after heavily cutting it to make space for the enormous velocity stack the...