奔驰唯雅诺新老款燃油泵总成A6394701294，长途出行强力后盾

This replacement part matches OEM standards in material and process; pump body uses high-density engineering plastic with corrosion-resistant coating to endure long-term fuel exposure; durability tested on benches; life near OEM level. OEM A6394701294; fits Mercedes-Benz Viano new models; verify interface size for older models. Function: supplies stable fuel from tank to engine to maintain fuel pressure during long trips. Replacement difficulty: medium; remove rear seat and fuel pump cover; recommended for experienced technicians; ensure seal ring not misaligned to prevent leaks.