Mahle Fuel Return Line Seal Kit 01-04 GM 6.6L Duramax LB7

Removing or replacing injectors on your Duramax? Want to make sure the fuel return system seals properly when everything goes back together? This MAHLE Fuel Injector Seal Kit is designed to restore a secure, leak-free seal for the injector return lines on 6.6L Duramax engines. During injector service, the factory return line gaskets are crush-style seals designed for one-time use, meaning they should always be replaced when injectors are removed. This kit provides the correct OE-style sealing components needed to reseal the fuel return system properly, helping prevent fuel leaks, fuel pressure loss, and drivability issues. Whether you're performing a full injector replacement or routine maintenance, the GS33932 ensures your Duramax fuel system remains sealed and operating as intended.

The MAHLE GS33932 is manufactured to meet OEM-level standards, providing the same fit and sealing reliability as the original factory components. Built using high-quality sealing materials engineered to withstand constant exposure to diesel fuel, engine heat, and vibration, these precision-formed seals maintain long-term durability in demanding diesel environments. The kit features a direct-fit design for straightforward installation and proper sealing pressure when the injector return lines are reinstalled. As part of MAHLE’s OE gasket and sealing lineup, the GS33932 delivers dependable quality trusted by professional technicians and diesel engine builders worldwide.