I've almost done the flaming car trick in my 914 a couple of times. Fuel injected fuel lines are under high pressure. When they crack, they shoot out a fine mist of fuel perfect for ignition.
I installed a 9 footer in my Spyder. I figured more is better.
I also carry a fire extinguisher right by the drivers seat. If the Blaze-cut is activated, it'll probably suffocate the engine too. That'll be my first sign. There would be no way in hell to undo both straps and get the clamshell open to use the fire extinguisher in time, but I might be able to spray it into the carb vents on each side or the grill. The grill on a Spyder is not obstructed like in the Speedster. The Blaze-cut might buy me some time. Hopefully I'll never find out.
I was kicking around the idea of having a fire extinguisher plumbed to a sprinkler type system in the engine bay. I was thinking, the extinguisher could be triggered from the cockpit and still be removed to suppress a fire elsewhere if needed.