The front bearing seal is supposed to be created when the engine is running. If this seal is not made the engine will run poorly. Did you try leaning the engine out to see if that corrected the problem? Either way, i would replace the bearing. It will cost you no more than ten dollars and about 20-30 minutes of your time. Do the right thing to be safe because fuel shold not be blowing out<div>of the front bearing no matter how rich it is running</div>