All the fuel lines have been replaced. I have used copper (for specification see table below) for the fixed lines, and Gates Barricade® Ethanol-proof fuel pipes, fixed with double ear ‘O’ clips by the carburettors and stainless steel jubilee type clips elsewhere. Pipes are 5/16″ in internal diameter from the fuel tank to the fuel pump, and 1/4″ internal diameter from the fuel pump to the carburettors.
According to the US Code of Federal Regulations Title 33 Part 183.538 Metallic fuel line materials should be made of seamless annealed copper, nickel copper, or copper-nickel; and have a minimum wall thickness of 0.029 inches. This means renewing all the old steel fuel lines. I chose Copper, it is widely used, readily available from Triumph parts suppliers and easy to bend! It is 7.93mm id (5/16″) and has a 20swg (0.91mm) wall thickness. Some feel that Copper is inferior to ‘Kunifer’ (Copper Nickel) but I was reassured by an email from Automec that this was not the case.
Gates Barricade® Ethanol-proof fuel pipes are Compatible with ethanol, methanol and all blends of petrol and alcohol; achieve five times less fuel vapour permeation than conventional hoses; are rated for use to 50 PSI, for any carburettor application; also rated for temperatures from -40 to 125 degrees C°; however they are not suitable for high pressure fuel injection, only to be used on the low pressure fuel return systems.
