Product Description
FLEECE FPE-34611 LB7 DURAMAX INJECTION LINES COMPLETE SET OF 8
Original LB7 injection lines are notorious for corrosion, leaks, and breakage – all of which can destroy brand new injectors with metal contamination. The FLEECE FPE-34611 LB7 Duramax Injection Lines Complete Set of 8 gives your 2001–2004 GM 6.6L LB7 a fresh, high-quality set of high pressure lines engineered to restore reliable fuel delivery and protect your investment in injectors and tuning.
Each line in this Fleece Performance set is brand new (not remanufactured) and built from corrosion-resistant tubing with machined 4140 injector swivel nuts. This kit includes all eight lines – one for each cylinder – and directly replaces the factory LB7 injection lines so you can eliminate fuel contamination issues, prevent future leaks, and keep your Duramax running clean under stock or tuned power levels.
Key Features
- Complete set of 8 brand-new high pressure injector lines – no core charge
- Direct replacement for OEM LB7 lines prone to rust, cracking, and leaks
- Corrosion-resistant construction for long-term durability
- Machined 4140 injector swivel nuts for superior strength and sealing
- Engineered specifically for 2001–2004 GM 6.6L LB7 Duramax trucks
- Perfect complement to new injectors to avoid contamination-related failures
- Supports stock and performance builds with reliable, consistent fuel delivery
Vehicle Fitment
- Engine: 6.6L Duramax LB7 (common-rail)
- Model Years: 2001, 2002, 2003, 2004
- Chevrolet: Silverado 2500HD & 3500 (6.6L LB7)
- GMC: Sierra 2500HD & 3500 (6.6L LB7)
Line-by-line GM cross-reference:
- (Qty 2) Cylinders 1 & 8 – Replaces GM Part# 97188720
- (Qty 2) Cylinders 2 & 7 – Replaces GM Part# 97188723
- (Qty 2) Cylinders 3 & 6 – Replaces GM Part# 97188721
- (Qty 2) Cylinders 4 & 5 – Replaces GM Part# 97188722
Cross-Reference & Related Fleece Products on CPP Diesel
Pair your FPE-34611 LB7 line set with these matching Fleece Duramax components from CPP Diesel:
- LB7 high pressure injection line (cylinders 1 & 8):
FLEECE FPE-FL-LB7-18 LB7 HIGH PRESSURE INJECTION LINE (1 AND 8) FLEECE - LB7 high pressure injection line (cylinders 2 & 7):
FLEECE FPE-FL-LB7-27 LB7 HIGH PRESSURE INJECTION LINE (2 AND 7) FOR 01-04 DURAMAX LB7 FLEECE - LB7 high pressure injection line (cylinders 3 & 6):
FLEECE FPE-FL-LB7-36 LB7 HIGH PRESSURE INJECTION LINE (3 AND 6) FOR 01-04 DURAMAX LB7 FLEECE - LB7 high pressure injection line (cylinders 4 & 5):
FLEECE FPE-FL-LB7-45 LB7 HIGH PRESSURE INJECTION LINE FOR 01-04 DURAMAX LB7 (4 AND 5) FLEECE - High performance CP3 upgrade for Duramax:
FLEECE FPE-DMAX-CP3K DURAMAX CP3K - PowerFlo 750 CP3 high output pump:
FLEECE FPE-DMAX-CP3-10MM DURAMAX POWERFLO 750 CP3 - 2004.5–2007 GM PowerFlo in-tank lift pump:
FLEECE FPE-34789 2004.5-2007 GM POWERFLO IN-TANK LIFT PUMP - 2007.5–2010 GM PowerFlo in-tank lift pump:
FLEECE FPE-34790 2007.5-2010 GM POWERFLO IN-TANK LIFT PUMP
Installation Notes
- Designed as a direct-fit replacement for factory LB7 high pressure lines
- Best practice is to replace lines any time injectors are replaced to avoid contamination
- Torque injector line nuts to factory specifications and follow OE torque sequence
- Verify cleanliness of all sealing surfaces and always prime the fuel system properly after installation
Specifications for FLEECE FPE-34611
| Specifications for FLEECE FPE-34611 | |
|---|---|
| Brand | Fleece Performance Engineering |
| Part Number | FPE-34611 |
| UPC | 670875715028 |
| GTIN (EAN-13) | 0670875715028 |
| Engine Compatibility | 2001–2004 GM 6.6L Duramax LB7 (Chevrolet Silverado & GMC Sierra 2500/3500) |
| Configuration | High pressure injector line set, complete set of 8 (cylinders 1–8) |
| Construction | Corrosion-resistant steel lines with machined 4140 injector swivel nuts |
| GM Cross Reference | (Qty 2) 97188720 (cyl 1 & 8), (Qty 2) 97188723 (cyl 2 & 7), (Qty 2) 97188721 (cyl 3 & 6), (Qty 2) 97188722 (cyl 4 & 5) |
| Included | Eight (8) new high pressure injector lines – no core charge required |
| E-codes | Not specified |
| Country of Origin | USA (per distributor listings) |
| Approximate Shipping Weight | 4.4 lbs (packaged) |
| Package Dimensions (L x W x H) | Approx. 16.0" x 12.0" x 3.0" |
| Shipping Method | Free Ground Shipping (continental U.S., where applicable) |
| Warranty | 1 Year Limited Parts Warranty (Fleece Performance) |
| Prop 65 Warning | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
FAQ
Why should I replace my LB7 injection lines when I do injectors?
Re-using old LB7 injection lines is one of the leading causes of contamination in new injectors. Rust, debris, and microscopic corrosion inside the original lines can be pushed directly into your brand new injectors and high pressure pump. Installing this new FPE-34611 complete set helps protect your fuel system and your investment in injectors.
Do these lines fit all 2001–2004 Duramax trucks?
Yes. The FPE-34611 set is designed specifically for 2001–2004 GM 6.6L LB7 Duramax engines found in Silverado and Sierra 2500HD and 3500 models. Always confirm you have an LB7 (not LLY) before ordering.
Are these remanufactured or new injection lines?
These are brand new Fleece Performance injector lines – not remanufactured. There is no core charge, and every line is built from corrosion-resistant material with new 4140 swivel nuts for a clean, tight seal.
Will this kit support tuned or higher-horsepower LB7 builds?
Yes. As long as fuel system tuning and components are matched correctly, these high pressure lines are suitable for stock and performance applications. They do not restrict fuel flow compared to OEM and are designed as a durable, OE-equivalent (or better) replacement.
Do I need any special tools to install these lines?
Installation generally uses common hand tools plus a torque wrench to tighten line nuts to factory specifications. Because injector and line service is sensitive to contamination and sealing, many owners choose to have a qualified diesel technician perform the work, especially when installing new injectors at the same time.
Is there a Prop 65 warning for this product?
Yes. Like many automotive parts, this product carries a California Proposition 65 warning for cancer and reproductive harm. For more details, visit www.P65Warnings.ca.gov .
