Preheat oven to 350°F (175°C).

Grease and flour an 8 1/2 x 4 1/2 inch loaf pan.

In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt.

In a separate bowl, whisk together eggs, melted margarine, orange juice, and orange zest.

Pour the wet ingredients into the dry ingredients and stir until just combined.

Gently fold in the chopped pecans.

Pour the batter into the prepared loaf pan.

Bake for 50 minutes, or until a wooden skewer inserted into the center comes out clean.

Let the bread cool in the pan for 10 minutes before transferring to a wire rack to cool completely.