First off, do they all have that foam insulation material between the shields and the tank? Mine does, but looking at pictures of others that doesn't appear to be a universal truth.
Anyway, it seems that the insulating foam material between the fuel tank heat shields and the tank itself also serves as an adhesive of sorts. When I popped the shields off, I broke that adhesive bond, obviously. How do I get it back? Add glue? More foam? Also, if I were to get new heat shields, do they come with foam preattached? Or is it a kind of foam I can buy in the store and just spray in there?
Here's a diagram of the heat shields. Each side is made of the 3 parts.
Second diagram is a view of the fuel system and they show only the lower part on one side for reference.
Also bear in mind, in a rear impact you might have tank to heatshield to exhaust pipe direct contact. The shields would act like a heat sink cooling the pipe when it's pushing on the tank.
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