Fuel, Primer, Oil Injection Line & Carburator Vent Lines BLACK - Reinforced hose is ideal for impulse lines that connect to fuel pumps BLUE - Top grade 100% polyurethane is not affected by subzero temperatures. Colored fuel line customizes your engine compartment. Visual confirmation of fuel flow PINK - Mikuni OEM quality vent lines keep fuel off your engine. Sold in pre-cut 11.5 lengths.