In a bowl, mix together flour, sugar, bicarb soda, baking powder and spices.
In another bowl, stir together vegetable oil, pumpkin puree, eggs and orange juice. Fold in flour mixture and pour into a greased loaf tin.
Bake in preheated oven for 1 hour. Test with skewer for doneness. If the cake is browning too much, place a piece of foil over the top and return to the oven.
Allow to cool for a few minutes, then remove from tin. This cake also freezes well.