EF1000 gas flow problem

I have an EF1000 generator that ran flawlessly until the starter rope broke. I had a local mechanic replace the starter rope.  Afterwards it was very hard to start.  I performed a thorough maintenance including new plug, new oil, clean filters etc.  The engine will now start but as it runs gas is flowing out the bottom of the unit.  I have not been able to find the source of this overflow.  In addition I do not know of any reputable mechanic in the area (Boston, MA) that services small generators.  Does anyone have a suggestion as to the cause of this problem.

Joe