In a large bowl, combine sugar and oil. Add eggs; mix well. Stir in the pumpkin, chocolate and vanilla; mix well. Combine the dry ingredients; stir into pumpkin mixture just until blended. Stir in chips.
Transfer to three greased 9-in. x 5-in. x 3-in. loaf pans. Bake at 350° for 55-65 minutes or until a toothpick inserted near the center comes out clean. Cool for 10 minutes before removing from pans to wire racks. Wrap and freeze for up to 6 months. Yield: 3 loaves.