Place the flour in a large bowl. Make a well in the center of the flour. Place the pumpkin, sour cream, maple flavoring, and syrup in the well. Mix the pumpkin mixture into the flour to make the dough until stiff. Roll the dough on a lightly-floured surface. Cut into 8 biscuits. Dip each biscuit into the melted shortening and place the biscuits on the baking sheet with the side that was dipped in shortening facing up.