Hello and thank you for contacting AaE for help.

This is the time of the year when the sap starts running in Maples due to the warmer temperatures; so it may be normal.  Sap can ooze or drip from holes in the tree's bark made by birds or from broken branches or cracks in the bark. However, if there is a large split in the bark where sap is oozing out, then you may want to have it checked out for disease.  If after examining it carefully and determining that there are no large cracks where sap is oozing out, I'd chalk it up to normal sap running.

As for the species of maple, if the tree's leaves are bigger than a man's hands, I might guess it is a Norway maple.  They can keep their leaves pretty late in the fall.

I hope this helps.