Mahle Fuel Return Line Seal Kit 01-04 GM 6.6L Duramax LB7
This product is vehicle-specific. Select your year, make, model, engine and transmission to confirm compatibility before adding it to your cart.
Select your truck to continue
Ships directly from the supplier. The final shipping cost will be shown before payment.
- Ships from MAHLE
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.
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.
Diesel Power Products directs warranty claims to the respective manufacturer; coverage and duration depend on that manufacturer and product. Its one-year manufacturer-defect warranty applies only to products manufactured by Power Products Unlimited Inc., not all products it sells. Manufacturer inspection is required; DPP does not pay inspection/return shipping or labor.
Return and warranty information is based on what Diesel Power Products offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
Diesel Power Products warranty policyView complete warrantyProduct conditions
Return and warranty information is based on what Diesel Power Products offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
Professional installation is recommended.
- Return eligibility
- Diesel Power Products states a 30-day window from receipt for eligible new, uninstalled, unopened and complete items in original packaging, with prior approval/RMA. Custom tuners and specified opened tools are excluded. Customer pays return shipping; original outbound shipping, including initially free shipping, is deducted. No standard restocking percentage is stated for ordinary approved returns. Based on what Diesel Power Products offers.
- Return window
- Not stated for this product; see supplier terms
- Restocking fee
- See supplier terms; no product-specific fee stated
- Return shipping
- Based on the supplier’s return policy; see terms
- Made to order
- No
- Backorder status
- Not backordered
- Cancellation
- Subject to supplier terms; contact FullSpecDiesel before requesting cancellation
- Warranty provider
- Diesel Power Products
- Warranty duration
- Product-specific duration not stated; see supplier terms
- Compatibility
- Listed for specific vehicle configurations
- Legal use
- Street legal
- Processing estimate
- 3–7 business days supplier processing
- Shipping
- Shipping calculated at checkout
- Signature
- No signature requirement
- Supplier
- Diesel Power Products
Product compatibility is based on the vehicle and product information provided. Review your selected truck, product options, measurements, modifications, and installation requirements before ordering.