I am making a custom furnace called a refueler, and it refuels specific items if you put a bucket of oil in the fuel section of it. I want to make two recipes that will only work if you  use the refueler, not the normal vanilla furnace, how could I do that?

Take a look at the vanilla furnace recipes class and essentially copy it, change the recipes to suit your needs, and instead of calling FurnaceRecipes.getFurnaceRecipes...blah blah blah in your tileentity and container, (should be about 3 places, 2 in TE, 1 in container) and that should do it.

 

Let me know if you need further info.