fuel tank question

[stof]

Hi,

im just wondering whether for single venue rallys if any of you guys put a guard under your fuel tank or anything? what are the regulations reguarding the tank? The bulkhead is currently all sealed etc. Anything else i shoudl know.

I'm asking this becasue i am planning on putting a fuel tank in the boot and i have taken the spare wheel well out. Im just wondering whether i could simply place a fuel tank where the hole is, or would it need some kind of guard? Its for a e30 by the way!

Thanks

Chris