if you owners manual says #8 is for an air pump and theres no plugs for a fuse to go into the #8 spot then I'd say that you don't have an air pump on your car.
If your car is like my 99 SVT then your cabin fuse panel is behind the panel under the steering column. You'll have to pop out a few plugs to expose the screws. You can use an awl or a real small flat tip screw driver to pop out the plugs.
