Preheat the oven to 350F and grease 9 by 13 inch pan, set aside.
In a mixing bowl whisk 4 eggs, 1 1/2 cup white sugar, 1 cup vegetable oil and pumpkin puree.
Using a sifter, sift together into the pumpkin mixture: 2 cups of flour, 2 teaspoons of baking powder, 1 teaspoon of salt, 1 teaspoon of baking soda, 2 teaspoons of ground cinnamon. Whisk until everything is combined and there are no lumps in the batter.
Pour the batter into the greased baking pan and bake for about 25 - 30 minutes, until toothpick comes out clean when inserted into the cake. Let the cake cool for 30 minutes before crumbling. Crumble the cake using your hands.