Preheat the oven to 350 degrees F (175 degrees C). Grease and flour three 9x5-inch loaf pans.
Mix pumpkin, oil, sugar, and eggs together in a large bowl. Combine flour, baking powder, baking soda, salt, cinnamon, nutmeg, and cloves in a separate bowl; stir into pumpkin mixture until well blended. Divide batter evenly between the prepared pans.
Bake in preheated oven until a toothpick inserted into the center of each loaf comes out clean, about 45 minutes to 1 hour.
