This is a rigid, stainless steel pipe designed to transport fuel under extremely high pressure from the high-pressure fuel pump (HPFP) to the fuel rail (which then feeds the injectors). Because modern BMW and MINI engines often use Direct Injection, the fuel needs to be pressurized significantly higher than in older port-injection systems. This metal line is built to handle those intense physical stresses without expanding or leaking. Common Applications This specific part is most commonly found in vehicles equipped with the N54, N55, or N63 engines. You’ll find it in models such as: • BMW 3 Series (335i) • BMW 5 Series (535i, 550i) • BMW X5 / X6 • MINI Cooper S/JCW (certain turbocharged variants)
