Fuel lines are the critical conduits that transport fuel from the tank to the engine, ensuring its smooth operation. These lines are typically made of durable materials like steel or nylon to withstand high pressure and potential exposure to heat and chemicals. Fuel lines come in various sizes and materials, depending on the specific application. Common materials include rubber, nylon, and steel. The type of fuel line used is determined by factors such as pressure, temperature, and compatibility with the fuel type.