In medium bowl, stir together flour, baking powder, baking soda and salt; set aside.
In large bowl, using electric mixer, beat together butter and sugar until light and fluffy.
Beat in egg, orange peel and orange juice.
Alternately stir in one-third flour mixture and one-half undrained crushed pineapple until just blended, ending with flour.
Stir in raisins and walnuts.
Pour batter into 9 x 5 inch loaf pan sprayed with non-stick vegetable cooking spray.
Bake at 350°F for 60 minutes or until toothpick inserted in center comes out clean. Cool in pan 10 minutes, remove from pan and cool completely on wire rack.