L5P|L5D Duramax Fuel Injector Installation Kit – Cylinders 1, 3, 6 & 8 | Alliant Power AP0132

Replace injectors the right way on your 6.6L L5P or L5D Duramax. The Alliant Power AP0132 kit gives you the correct high-pressure fuel line plus the seals needed for cylinders 1, 3, 6, and 8 so you get a factory-style seal without hunting down individual GM parts.

High-pressure injector lines on the L5P are typically treated as one-time-use. When you pull an injector, install a new line and fresh seals—this kit is built for that job.

What’s Included

• 1 high-pressure injector feed line (shaped for cylinders 1, 3, 6, or 8)
• 1 injector body O-ring
• 1 injector chamber gasket (copper washer)

One kit services one injector. Order the quantity you need.

Fits

• 2017–2026 Chevrolet Silverado 2500HD / 3500HD 6.6L L5P Duramax
• 2017–2026 GMC Sierra 2500HD / 3500HD 6.6L L5P Duramax
• 2019-2026 GM 6.6L L5D Duramax (Cab & Chassis: 4500HD / 5500HD / 6500HD)
• Related International CV applications with the 6.6L Duramax

Note: Cylinders 2, 4, 5, and 7 use a differently shaped line (typically Alliant AP0131). Confirm cylinder number before ordering.

Why This Kit

Alliant Power builds to OEM specifications for first-time fit and reliable sealing under the high rail pressures of the L5P common-rail system. You get OEM-quality components without the dealer markup, plus the convenience of line + seals in one package.

Common OE / aftermarket cross-references include GM 12685924, 12687230, 12720157.

Key Points

• Direct-fit replacement for the specified cylinders
• Restores proper high-pressure sealing
• Sold individually — one kit per injector
• 2-year / unlimited-mileage warranty

Always follow GM service procedures for fuel system work, including proper torque on the injector hold-down and line fittings, and keep the system clean.

Ideal for injector replacement, leak repair, or preventive service when lines have been disturbed. Pair with the matching kit for the opposite cylinder group if you’re doing a full set.