INDUSTRIAL INJECTION RTF26401 GM INJECTOR & RETURN WASHERS - 2001-2004 6.6L DURAMAX LB7 (SERVICES 4 INJECTORS)

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

The RTF26401 washer set services four injectors. For all eight, order two kits.

Yes-crush washers are designed for single use. Replacing them helps ensure a leak-free reassembly.

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.

This is an Industrial Injection service kit built to LB7 specifications and intended for use during injector service.