Preheat oven to 350°F.
Stir together flour, orange zest, and baking powder in a medium bowl. Set aside.
Beat sugar, vegetable oil, and eggs with an electric mixer on high speed until almost white, about 1 minute and 30 seconds.
Add orange juice; beat on low speed until combined, about 20 seconds.
With mixer running on low speed, gradually add flour mixture. Beat until just combined, about 1 minute (do not overmix).
Transfer batter to a greased (with vegetable oil) and floured 9-inch tube or Bundt pan.
Bake in preheated oven until a wooden pick inserted in center comes out clean, 40 to 45 minutes.
Let cool in pan 10 minutes.
Invert cake onto a wire rack; let cool completely, about 1 hour.
