Fuel / Vacuum Line Hose AssortmentA fuel line is a hose or metal tube that carries fuel from the tank to the engine. Its built to handle pressure and resist corrosion or swelling from gasoline diesel or ethanol blends. Fuel lines are critical for maintaining proper fuel delivery and engine performance. A vacuum line is a small hose that carries air or vacuum pressure between parts of the engine and its control systems such as the brake booster PCV valve or emissions components. These