I remember this cake from when I was a kid and my mom used to make it. I remember it was yummy, but it's been years. Hope this is what you're looking for.

7-UP Cake

1 1/2 Cups Butter -- Softened
3 cups sugar
5 eggs
3 cups flour
1 tablespoon lemon extract
3/4 cups 7-Up®

confectioner's sugar for dusting

Preheat oven to 325.
Grease an angel food cake or bundt pan.
Cream together butter and sugar until smooth.
Beat in eggs, one at a time and mix until thoroughly combined.
Fold in flour, lemon extract, and 7UP and mix well.
Bake for 1 hour and 15 minutes or until a toothpick inserted in the center comes out clean.
Sprinkle with confectioner's sugar.