High Pressure Injection Line (4 and 5)

Features:

• Fits 2001–2004 6.6L Duramax LB7 engines
• Direct replacement for lines 4 and 5
• Replaces GM part number 97188722
• Made with corrosion-resistant materials
• Features machined 4140 injector swivel nuts
• Prevents contamination during injector changes
• Ideal for injector upgrades or line failures
• Built for durability and long service life

Upgrade Your Lines Before They Leave You Stranded

If you're working on your 2001 to 2004 LB7 Duramax, replacing worn injectors or dealing with hard-start issues, now is the time to replace those old, corroded high-pressure lines. The Fleece FPE-FL-LB7-45 High Pressure Injection Line is a direct replacement for injector lines 4 and 5 and is specifically designed to upgrade the reliability of your fuel system. The original GM lines are known to corrode from the inside out, often breaking or flaking apart during removal and causing contamination that can ruin a brand-new set of injectors. Swapping them with this upgraded line helps prevent costly failures and gives you peace of mind that your fuel system is clean and secure.

Built Stronger with Precision Materials

Fleece doesn't just duplicate the factory design—they improve it. This line is built with corrosion-resistant materials and features precision-machined 4140 injector swivel nuts for a tight, durable fit that holds up under pressure. Whether you’re doing routine maintenance, recovering from a failed injector, or simply planning ahead, this is a smart, preventative upgrade that saves time and protects your investment. It installs just like the factory piece but delivers far better longevity and reliability. For anyone serious about keeping their LB7 running strong, this replacement line is a small part that plays a big role.

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