Preheat oven to 325 degrees F. Grease a loaf pan. Blend sugars and oil. Add egg yolks and whip until light and fluffy, about 5 minutes. Then add pumpkin. Sift dry ingredients together and then combine with the wet mixture; adding water while mixing. Pour batter into loaf pan. Bake for 50 to 60 minutes. Test for doneness with a toothpick.