Page 63 of the NHRA rule book says .024 steel or .032 aluminum bulkhead if fuel cell is in trunk. Listen to the guys on the regulator. It needs to be as close to carb as possible. My engine is fed with an AN-10 with AN-8 return. There are cheaper, safe ways to go besides the braided stainless and aluminum fittings. If cost is an issue, which it certainly is for me look into other materials.
