Preheat oven to 350°F (175°C).
In a large bowl, mix pumpkin puree, sugar, and oil.
Add eggs one at a time, beating well after each addition.
In another bowl, combine flour, baking powder, baking soda, cinnamon, nutmeg, and salt.
Gradually add dry ingredients to the pumpkin mixture, mixing until just combined.
Pour batter into a greased baking dish.
Bake for 45 minutes or until a toothpick inserted into the center comes out clean.
Let cool before serving.