High Pressure Injection Line (3 and 6)

Features:

• Fits 2001–2004 6.6L Duramax LB7 engines
• Direct replacement for injector lines 3 and 6
• Replaces GM part number 97188721
• Made from corrosion-resistant materials
• Features 4140 machined injector swivel nuts
• Prevents fuel system contamination
• Ideal during injector replacement or upgrades
• Built for durability and consistent performance

Replace the Weak Link Before It Becomes a Problem

If you're working on your 2001 to 2004 LB7 Duramax and replacing injectors, it’s a smart move to upgrade your high-pressure lines at the same time. The Fleece FPE-FL-LB7-36 High Pressure Injection Line is a direct replacement for cylinders 3 and 6, designed to eliminate one of the most common failure points in the LB7 fuel system. Stock lines are notorious for internal corrosion and weakening over time, which can lead to cracks, leaks, or worse—metal shavings contaminating your brand-new injectors. Whether you're doing preventative maintenance or fixing an existing issue, this line is a critical part of keeping your engine running clean and strong.

Built to Last and Made to Fit Right

Fleece Performance didn’t just copy the factory design—they made it better. This injection line is built using corrosion-resistant materials that stand up to years of exposure to fuel and under-hood heat. It's also fitted with precisely machined 4140 steel swivel nuts that ensure a secure seal at both ends, reducing the chance of fuel leaks and injector issues down the road. Installation is straightforward and hassle-free, with factory-style fitment that makes it a direct swap for GM part number 97188721. For anyone serious about long-term reliability and protecting their fuel system investment, this upgrade offers real peace of mind with every mile.

Fits: 2001, 2002, 2003, 2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7