Product Description
Refresh the injector return circuit on your 6.6L Duramax with the Industrial Injection RTF26410 kit. It includes the correct return adapters with O-rings, retaining clips, and return hose to service one bank of cylinders—order two kits to do both banks. Built for clean, leak-free installs on LLY, LBZ, and LMM engines.
Fitment
- 2004.5–2005 LLY 6.6L Duramax
- 2006–2007.5 LBZ 6.6L Duramax
- 2007.5–2010 LMM 6.6L Duramax
What’s Included
- Return adapters with O-rings
- Adapter retaining clips
- Length of return hose sufficient for either engine side (one bank)
Why This Kit
- Direct service kit for the injector leak-off/return circuit
- OE-style seals and clips to stop seepage and hard-start issues from return leaks
- Bank-specific length keeps routing clean; buy two to service all eight injectors
Recommended Parts (CPP internal links)
Helpful Notes
- This kit services one bank (either left or right). Order two kits to service the full engine.
- Use clean practices to avoid debris in open fuel lines; lightly lube O-rings before assembly.
- After installation, prime the fuel system and check for leaks at idle and light throttle.
FAQ
How many kits do I need to do the whole engine?Two kits—this package includes hose and hardware sufficient for one side (bank) of the engine.
Will this fit LB7 engines?No. This kit fits LLY (2004.5–2005), LBZ (2006–2007.5), and LMM (2007.5–2010). LB7 uses different return hardware.
What problems can return line leaks cause?Hard starting, rough idle, elevated return rates, fuel smell, and visible seepage around the injector tops/return fittings.
Do I need any special tools?Basic hand tools and line cutters work for most installs. Always verify clip engagement and hose routing clearances.
