Fitment - Fuel rail to fuel return pipe fit for Diesel 6.6 L Duramax LBZ / Duramax LMM engines from about 2004.5 to 2010; Models that use those engines: fit for Chevrolet Silverado 2500HD, fit for Chevrolet Silverado 3500HD, fit for GMC Sierra 2500HD, fit for GMC Sierra 3500HD, fit for Chevrolet Express and GMC Savana equipped with the 6.6 L diesel plus vans trucks Function - This fuel rail to fuel return pipe carries excess fuel from the fuel rail back to the return line/system instead of letting it build up pressure or overflow. Diesel Fuel Pipe part number is 97321375. Purpose - 97321375 fuel return hose assembly helps regulate fuel pressure by returning unused fuel and maintaining proper circulation in diesel fuel-injection (or return-style) systems. Replace a worn, cracked, or leaking fuel-return hose in a compatible with GM 6.6 L Duramax diesel engine. Restore proper fuel return flow in the diesel fuel system to avoid pressure problems, fuel leaks, or poor performance High Quality Materials: High quality manufacturing materials give it better wear resistance, elasticity, and tension strength. Part Number:97321375
Fitment — Which Vehicles / Engines It Works With:
Fuel rail to fuel return pipe fit for Diesel 6.6 L Duramax LBZ / Duramax LMM engines from about 2004.5 to 2010

Models that use those engines:
fit for Chevrolet Silverado 2500HD
fit for Chevrolet Silverado 3500HD
fit for GMC Sierra 2500HD
fit for GMC Sierra 3500HD
fit for Chevrolet Express and GMC Savana equipped with the 6.6 L diesel plus vans trucks