Cake: Preheat the oven to 350 degrees F.
Butter and flour a 12-cup bundt cake pan. In a large mixing bowl, combine the eggs, oil, pie mix, water, and pumpkin pie spice. Beat until well blended. Add the cake mixes and stir to combine. Transfer the mixture to the prepared pan and bake for 50 minutes, or until a skewer inserted in the center comes out clean. Invert the cake onto a cooling rack.
Glaze: Combine 2 parts yellow food coloring with 4 parts red food coloring to make orange food coloring. Whisk the powdered sugar, orange juice, orange liqueur, and food coloring in a saucepan on low heat for 5 minutes or until the sugar melts. If the glaze seems too dry, add more water or orange juice to reach the right consistency. Drizzle the glaze over the cake.