Heat oven to 350 degrees (325 if using darker or nonstick coated pan). Spray bundt style pan with Baker's Joy.
Sift and mix first 3 ingredients and set aside. Combine sugar and eggs in a bowl of stand mixer and beat at medium speed for about 3 minutes. Add remaining cake ingredients, scraping sides of bowl as needed. Pour into prepared pan and bake one hour, checking done when cake tester/skewer comes out with only few crumbs. Transfer pan to a cooling rack and let cool 10 minutes before turning out onto a cake plate.
To make Grapefruit Syrup: combine ingredients in saucepan and simmer about 1 minute, stirring to dissolve sugar and set aside.
After cake has cooled some, poke holes all over with wooden skewer and gently spoon syrup all over and let soak in, taking time to let it soak through if needed.
Stir ingredients for glaze in a small bowl and spoon drizzle over the top of the cake. Can be served warm or chilled with a dollop of Cool Whip on top! Enjoy...