Preheat your oven to 350°F (175°C). Grease a loaf pan.
In a large bowl, whisk together flour, baking soda, baking powder, salt, sugar, and cinnamon.
In another bowl, combine vegetable oil, beaten eggs, and vanilla extract.
Stir the wet ingredients into the dry ingredients until just combined.
Fold in the grated zucchini and drained crushed pineapple.
Pour the batter into the prepared loaf pan.
Bake for about 60 minutes, or until a toothpick inserted into the center comes out clean.
Let the loaf cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.