The Alliant Power AP0133 is a new fuel injector return line seal kit for 2017–2025 GM L5P Duramax applications. Alliant’s Fuel Injection Return Line Gasket Kit provides sealing components used during fuel injection return-line service.

Features & Benefits

• New Alliant Power Fuel Injector Return Line Seal Kit (Alliant P/N AP0133)
• Fit, form, and function tested to meet or exceed original-equipment standards (per Alliant Power)
• Direct replacement for 12654651 / 6040526C1
• Backed by Alliant Power’s 24-month, unlimited-mileage warranty

Application

• Chevrolet Silverado 2500 HD / Silverado 3500 HD (2017–2020)
• Chevrolet Silverado 2500 HD / Silverado 3500 HD (2017–2025)
• GMC Sierra 2500 HD (2017–2020)
• GMC Sierra 2500 HD / Sierra 3500 HD (2017–2025)
• Chevrolet Silverado 4500 HD / Silverado 5500 HD / Silverado 6500 HD (2019–2020)
• Chevrolet Silverado 4500 HD / Silverado 5500 HD / Silverado 6500 HD (2019–2025)
• Alliant Power lists additional vehicle applications for this part number

Always verify fitment against your VIN, engine, and OE part number before ordering.

Cross-Reference / Replaces

• General Motors: 12654651
• Navistar: 6040526C1
• Alliant Power: AP0133

Warranty: Alliant Power’s standard warranty: 24 months with unlimited miles/hours on installed parts (Alliant Power warranty policy, rev. Aug 2025).