Heat oven to 325. Spray a 10" bundt pan w/ cooking spray. Sprinkle pecans into bottom of pan. In lg bowl, combine cake mix and pudding. Mix, beat in eggs, 1/4 cup water and 3/4 cup irish cream.
Beat for 5 mins. Pour batter over pecans and bake 60 mins, or until toothpick inserted in center comes out clean. Let cool. Invert cake onto serving platter.
In saucepan, combine butter, 1/4 cup water and sugar over medium heat, stir, bring to a boil. Boil 5 mins, stirring constantly. Remove from heat. Stir in remaining irish cream. Prick the top and sides of cake. Spoon glaze over top of cake, brush sides w/ glaze. Repeat until all of glaze is used.