Product Description
Refresh critical sealing points during an LB7 injector job with the INDUSTRIAL INJECTION RTF26401 Injector & Return Washers. This service kit services four injectors and includes the copper sealing washers required at the injector tip and return banjo locations to help prevent fuel leaks and hard-start issues.
Fitment
- 2001–2004 GM 6.6L Duramax LB7 (Silverado/Sierra 2500/3500)
What’s Included
- Injector sealing/return washer set — services 4 injectors
Why It Matters
- Restores sealing at injector and return banjo interfaces to reduce fuel leaks
- Recommended any time injectors are removed or replaced
- Budget-friendly insurance against rework during LB7 injector service
Recommended Parts (CPP Internal Links)
- BD Diesel 1050141 LB7 Injector Install Kit
- BD Diesel 1050140 LB7 Injector Line Set
- Fleece LB7 High-Pressure Lines (Cyl 1 & 8)
- Alliant AP0059 Return Line Banjo Bolt
- Industrial Injection PDM-07021K Screw-In Injector Cups
- Shop All Duramax Gaskets & Seals
Cross-Reference / Alternatives (Internal Links)
- DTech DT660020 Fuel Return Line Kit (includes banjo washers)
- MAHLE GS33500A Fuel Injector Seal Kit (LB7)
Installation Notes
- Clean mating surfaces thoroughly; never reuse crush washers
- Follow OE torque specs on return banjo bolts and high-pressure lines
FAQ
How many injectors does this kit service?The RTF26401 washer set services four injectors. For all eight, order two kits.
Do I need this if I’m just checking an injector?Yes—crush washers are designed for single use. Replacing them helps ensure a leak-free reassembly.
Will this fix a leaking return line by itself?It replaces the sealing washers. If your banjo bolt or return line is damaged or corroded, pair this kit with a new bolt/line from our recommendations above.
Is this kit OEM?This is an Industrial Injection service kit built to LB7 specifications and intended for use during injector service.
