A fuel line is a hose used to bring fuel from one point in a vehicle to another or from a storage tank to a car. It is commonly made of reinforced rubber to prevent splitting and kinking.
The United States Environmental Protection Agency defines a fuel line as “all hoses or tubing designed to contain liquid fuel or fuel vapor. This includes all hoses or tubing for the filler neck, for connections between dual fuel tanks, and for connecting a carbon canister to the fuel tank.
This does not include hoses or tubing for routing crankcase vapors to the engine’s intake or any other open hoses or tubing to the atmosphere.”