This disclosure provides a fuel line assembly for use with an internal combustion engine, an internal combustion engine including such as fuel line assembly, and a method for providing leak containment and detection in a fuel system, each of which include a double-walled fuel line including a high pressure fuel line component. The system and methods include direct growth of graphene on diamond and low temperature growth of graphene using a solid carbon source. A wire-wound heating element is wrapped around the exterior surface of the central core and an outer housing surrounds the heating element and the central core. The mail is then sorted and processed in the lean room. A shielding cover, positioned over a measured device on a glass substrate held on the stage, has an area not smaller than an area of the measured device and not greater than four times the area of the measured device.