You could build a sheild.
Im not building a plane but could'nt you use inswool in between the shield or just rap your fuel lines with it. It's good for 2300 Deg. It comes in different thicknesses 1 and 2 inch matt and is the material that they uses for gas forges and melting pots for steel . It is light weight and is sorta like fiberglass insulation and would possibly be good for a sandwich layer around the fusalage area and firewall since it would take a lot of heat to get it past 2300 deg. Wear a resperator when fooling with the stuff as it gets in the air and into your lungs. Mark your sitie is way cool and I enjoy your input along with most the rest. No time Rick!