Bulk Head Between Cockpit and Trunk

I have been racing for a while, but I wanted to get some other opinions. IT related obviously.

If you are racing a sedan and you have holes/ gaps in the bulkhead between the cockpit and the trunk do you have to fill them? Do you have to fill them even if there is no gas tank, filler hose, or any gas lines in the trunk?

If there is a gas hose of some sort, that is a no brainer.

I thought somewhere in the GCR in two places it said two separate things.

If there is nothing fuel related or gas tank related in the trunk or open to the trunk, then why the need to fill any holes? It would be no different then running a hatch back wouldnt it? Is there something I am not thinking about.

Just looking for some opinions and interpretations.

Thank you,

Derek

A bulkhead is only required in the case of fuel systems.