InfinitiPartsDeal.com offers the wholesale prices for genuine 2010 Infiniti FX50 parts. Parts like Fuel Tank are shipped directly from authorized Infiniti dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.5L, 6 Cyl 3.7L, 8 Cyl 5.0L. Trim: Base, Premium, Sport.