In a large bowl, whisk to combine the flour, sugar, baking powder and salt. Whisk in the buttermilk, eggs and butter until combined.
Heat the oil over medium heat in a large nonstick skillet. Fry four of the sausage patties until cooked through, 2 to 3 minutes per side. Pour a scoop of batter over each of the patties and cook until golden; flip and continue cooking until the batter is set, another 3 to 5 minutes. Transfer to a platter and keep warm in the oven while you cook the remaining four sausage pancakes in the same manner. Serve with maple syrup.