Preheat oven to 350 degrees.
Prepare bundt pan by liberally coating with butter followed by a dusting of flour being sure to get in all crevices.
In large bowl, combine cake mix, eggs, oil and pineapple mixing well.
Pour batter into prepared bundt pan and bake for 40-50 minutes or until toothpick comes out clean
Let cake cool for about 10 minutes before turning out onto serving plate