Preheat your oven to 350°F (175°C) and grease a 9x5 inch loaf pan.
In a large bowl, whisk together the sugar, oil, eggs, lemon juice, and vanilla until smooth.
Stir in the grated zucchini.
Add the flour, baking soda, baking powder, and salt. Mix until just combined. Fold in the lemon zest.
Pour the batter into the prepared pan and bake for 50–55 minutes or until a toothpick comes out clean.
Let it cool in the pan for about 10 minutes, then remove and transfer to a wire rack to cool completely.