Genuine BMW Fuel Tank Ventilation Valve With Pipe (X3 Z4) - 13907530264: Genuine BMW Fuel Tank Ventilation Valve With Pipe (X3 Z4) - 13907530264 is an original BMW part designed to replace the factory-installed fuel tank ventilation valve and pipe. The valve helps to ensure a safe and efficient fuel system and helps to prevent vapor lock and fuel system contamination.