In an electric mixer, beat the oil, sugar, eggs, and pumpkin until smooth. Sift together the flour, baking powder, baking soda, cinnamon, allspice, salt, and cloves. Add the flour mixture and the water to the egg mixture, alternating flour and water and beginning and ending with the flour mixture. Fold in the walnuts. Pour into the loaf pans and bake for 1 hour and 10 minutes, or until a toothpick inserted into the center of each loaf comes out clean.