Fuel lines, which attach all the units of the fuel system, are typically made of rolled steel or, sometimes, of drawn copper. Steel tubing, when used for fuel lines, is normally rust proofed by being copper or zinc plated. Fuel lines are located as far away from exhaust pipes, mufflers, and manifolds as possible, so that extreme heat will not cause vapor lock.

They are attached to the frame, the engine, and other units in such a method that the effect of vibration is minimal, and so that they are free of call with sharp edges which might cause wear. In areas where there is a lot of group, as between the car’s frame and rubber-mounted engine, short lengths of petrol resistant flexible tubing are used.