Gee you Americans are such safety pansies
, I'm surprised you can ever muster up enough courage to even take your car on the track
.
As for fuel lines, or anything on any 'to be tracked car', do it by the rule book or don't do it at all. Nothing more upsetting than turning up for your first race and being told your car does not meet the necessary safety, etc. requirements.
If you run your sold fuel lines under the car but up next to chassis members they are pretty damn safe and that is why manufacturers usually put them there. A rock is not going to hurt a fuel line by bouncing off ... but a car bottoming might, but that is why they are routed next to chassis rails ... as the chassis rail will take the hit. In the end nothing is ever perfectly safe, that is impossible.
If you do end up routing through the car then I like the flexible hose idea, thus in a major crash hopefully the line will just flex and not burst and spray fuel on the driver (wouldn't matter as much if outside the car).
I hope you also have vented your hopefully sealed battery box ... now that it is the same 'space' that the driver is as if you roll that car you will now have acid rolling around the passenger area UNLESS you 100% seal the rear bulkhead (often a rule requirement, especially if you have fuel tank above the floor, etc.). I ran my club car with the battery in the passenger foot well, with a foam sponge on top of the battery to soak up any acid ... if I ever flipped it.
Now please go and get that rule book and stop guessing
.
Pete