[DanEC]

Lippy - back to your question. I believe you are asking about the trunk floor pan which is about 3/16 inch above the fuel tank. I drilled my holes with the tank installed. The bit tagged the tank a few times but nothing more than a peck. Removing the tank would be safer, or an adjustable drill stop collar would work also. But you might look closely - seems like ERA had predrilled most of these holes but since I was having some problem getting the big trunk floor pan to line backup all the way around, I re-drilled some of them.