Mercedes-Benz Viano 639 Chassis Fuel Pump Assembly A6364700094, Precise Fuel Supply

Mercedes-Benz Viano 639 chassis: rear fuel pump assembly with fuel pump, OEM A6364700094; if the vehicle has starting difficulty, weak acceleration, sudden stalling while driving, or an unstable fuel gauge reading, the fuel pump assembly may be aging or insufficient fuel pressure. Replaces with pump for stable fuel pressure and proper mixture; install with battery disconnected; clean the filler neck sealing surface; after replacement perform system purge to prevent vapor lock.