Preheat oven to 350℉ (180℃)
Spray loaf pan with non-stick spray and line with parchment paper. Make sure to leave the two long ends to overhang the pan so it's easy to lift the loaf out later.
Mix the flour, baking soda, salt, nutmeg, cinnamon, and sugar together in a large bowl.
Make a well in the centre of the dry ingredients and add the oil, eggs, pumpkin, and nuts. Mix everything well.
Pour the batter into the prepared loaf pan and bake for 1 hour and 10 minutes. (Start checking the loaf after 1 hour).
Test to see if the loaf is done by inserting a toothpick into the centre. The toothpick should come out clean with only a couple of crumbs attached.
Let the loaf cool in the pan on a wire rack for 15 minutes before lifting out to finish cooling directly on the rack.