How can fuel leak into the crankcase other than threw leaking fuel injectors?

Fuel pressure regulator - possibly... Remove the vacuum hose from pressure regulator and check for ANY sign of fuel there.. Tapping hose connector on engine or your palm may help reveal traces of gas in hose... Should be NO sign of fuel/gas outside of the regulator! .. Google for pictures...possibly video. http://www.doityourself.com/stry/7-symptoms-of-a-bad-fuel-pressure-regulator The above link should help explain, just in case you have no faith in FREE advice... Good luck with it!