I've looked at a [propane carburetor][1] for a chevy small block engine to be used on a rock crawler so the engine wouldn't stall during inclines but I haven't seen any recommendation on what should be used for the fuel lines from the tank to the carb.  Besides rubber hoses that can break if a vehicle roles what can be used to deliver propane gas to a propane carburetor?  


  [1]: http://www.amazon.com/Impco-Chevy-Propane-Holley-Barrel/dp/B00EP1L7QG