Preheat oven to 350 degrees.
Butter and flour three 9x5x3-inch loaf pans.
Sift together dry ingredients; set aside.
In a large bowl, cream shortening, sugar, and vanilla.
Add eggs one at a time, beating well after each addition.
Add pumpkin; mix well.
Add in dry ingredients alternating with water.
Mix until smooth.
Fold in nuts.
Turn batter into prepared pans.
Transfer to rack and cool for 10 minutes before removing loaf from pan.