http://www.heatshieldproducts.com/sonic-x.htm

This is a mat that does not burn.  You can put it over the engine hatch,
under the carpet, to prevent fires from getting into the interior.

You can also take the material off the engine hatch and put the mat on the
engine hatch, then add a layer of heat reflective on top to block engine
heat from entering into the interior from the engine hatch.  The burn proof
material will keep the hatch from burning and fueling the fire.  Adding a
fuel shut off switch tied into a heat sensor would keep the fuel from being
added to the fire.

You could also use a fuel line covering to protect the fuel line from an
actual fire.

http://www.heatshieldproducts.com/red-hot_sleeving.htm

When I had my 73 T4 2.0L engine drop a valve while doing 70, it caught the
fire wall foam engine seal on fire.  I had put the fuel line in a plastic
covering.  The covering burned and started to burn the cloth covering off
the fuel line buy the time I put the fire out.

I am currently looking for a fuel line that does not rot as the rubber ones
do over time. Therefore, the fuel lines would not be a problem and a future
hazardous candidate for fueling a fire.

Robert