Was it because of the material used to make the tank? This is not in the trunk anymore you know. Not discounting your heads up about NHRA's rules, but I can't see that tank penetrating the trunk floor and coming into the pilots compartment.
The area where the rubber connects the filler neck to the tank is considered "In the drivers compartment" Per NHRA. Your experience may vary, I never had an issue until I entered a large NHRA run Divisional event. Not just a weekly bracket race or test and tune, those I had no issue at.
That may be one of the dumbest interpretations of a rule I have ever heard.
