Preheat oven to 325 degrees F. Prepare your baking pans by lightly coating with cooking spray and lining with parchment paper
In a small bowl, sift together gluten free flour, guar gum (if needed), baking soda, cinnamon and salt and set aside.
In a large stand mixer, combine vegetable oil and sugar until well blended. Add one egg at a time, beating after each egg. Add vanilla. Beginning with the flour blend, add about ⅓ of flour blend to the egg mixture, combining and scraping down the side as needed. Then add about ⅓ of buttermilk and combine. Alternate this 2 more times until you have used all of the flour blend and buttermilk.
Add carrots, coconut, pineapple and pecans and stir until just combined.
Pour into prepared cake pans and bake:
For 3 - 8 inch round pans, bake for 35-40 minutes
For 2 - 9 inch round pans, bake for 30 - 35 minutes
For 48 cupcakes, bake for 20-22 minutes