01-04 GM 2500/3500 DURAMAX LB7 HIGH PRESSURE INJECTION LINE (#1 AND #8)

High Pressure Injection Line #1 & #8 | 2001–2004 Duramax LB7

Replace your outer injector feed lines with this direct-fit High Pressure Injection Line set for cylinders #1 and #8 on the 2001–2004 GM 2500/3500 6.6L Duramax LB7. From XDP, these lines are a precise OEM-style replacement for the most commonly damaged lines on the LB7 — restoring proper fuel pressure and eliminating leaks at the outer cylinders.

Why Replace Lines #1 and #8?

On the LB7 Duramax, the outer injection lines (#1 and #8) are the most exposed and most prone to cracking, chafing, and fitting failure due to their routing and proximity to heat sources. A leaking high-pressure line at these cylinders causes fuel loss, misfires, hard starts, and can lead to injector damage if left unaddressed. Replacing them individually saves cost when only specific lines are compromised.

Features

• Direct OEM-style replacement for injection lines #1 and #8
• Restores proper high-pressure fuel delivery to outer cylinders
• Eliminates fuel leaks and pressure loss at cylinders #1 and #8
• Direct fit for 2001–2004 6.6L Duramax LB7 — no modification required
• From XDP — a trusted supplier of diesel fuel system components

Fitment

• 2001–2004 GM Silverado/Sierra 2500/3500 6.6L Duramax LB7

Targeting a specific leak? These individual line replacements let you fix exactly what's failed without replacing the entire set.