I prefer to keep fuel lines outside of the car and as use as little rubber lines as possible; even it you incase it in a steel tube.I ran 3/8" rubber fuel line through a length of metal electrical conduit tubing. Bent to shape and run through the interior of the car. It passes through th rear bulkhead and the firewall. This satisfies the it must be incased in metal part of the GCR.
Russ