1 1/2 cups vegetable oil
2 cups white sugar
3 cups flour
2 tsp baking soda
2 tsp baking powder
3 tsp ground cinnamon
1 tsp salt
2 cups solid pack pumpkin puree
1/2 cup chopped walnuts
Preheat oven to 375°F. Grease and flour a 10 inch tube pan. Sift together flour, soda, baking powder, cinnamon and salt. Set aside.
In a large bowl, combine oil and sugar. Add eggs one at a time and mix well. Add the flour mixture and beat until smooth. Add nuts and pumpkin and blend until smooth. Pour batter into greased 10 inch tube pan.
Bake at 375°F for 1 hour or until a toothpick inserted into the center of cake comes out clean. Cool in pan for 10 minutes, then turn out onto a wire rack and finish cooling. Dust with powdered sugar before serving.