Complete Alliant Power L5P Fuel Contamination Kit for 2020–2023 Duramax Trucks
If your 2020–2023 Chevy Silverado HD or GMC Sierra HD 6.6L Duramax has suffered fuel contamination or a HP4 failure, the Alliant Power L5P Fuel Contamination Kit AP54822 includes everything needed to restore your fuel system to factory‑spec performance. This comprehensive kit is designed for 2020–2023 GM 6.6L L5P Duramax engines and is the most cost‑effective way to replace damaged components after contaminated fuel or a failed HP4 injection pump.
Sold and supported by NorCal Diesel Performance out of Orangevale, CA, this kit is ideal for diesel shops, mobile mechanics, and serious DIY’ers who want an OEM‑quality, warranty‑backed solution for HP4 contamination repairs.
What’s Included in the Alliant Power L5P Fuel Contamination Kit?
- High‑pressure HP4 CP4 style fuel injection pump (Alliant Power calibrated, OE‑equivalent)
- Left and right side fuel rails for 6.6L L5P Duramax
- Premium fuel injectors matched to the L5P platform
- All necessary injector feed and return lines (complete set)
- Duramax‑specific fuel cooler and associated plumbing components
- Seals, gaskets, and critical O‑rings required for a full fuel system rebuild
- Simple, single part number (AP54822) so you don’t have to source components individually
Stop Damage Faster with a Complete L5P Fuel Contamination Kit
When contaminated fuel or a failed CP4 injection pump sends metal debris through a 6.6L Duramax’s fuel system, simply replacing the pump alone is not enough. Metallic wear particles can lodge in fuel rails, injectors, and high‑pressure lines, causing repeat failures and expensive comebacks. The Alliant Power AP54822 kit is engineered so you can replace the entire contaminated pathway in one job instead of playing “guess‑what‑else‑is‑bad.”
Alliant Power builds these fuel contamination kits “The Total Package” with genuine OE‑equivalent components that are tested to meet OEM performance standards. That means you’re not just replacing parts—you’re resetting the health of the entire fuel system so your customer’s truck can run reliably for years after the repair.
Fits: 2020–2023 Chevrolet & GMC 6.6L Duramax L5P Trucks
- 2020, 2021, 2022, 2023 Chevrolet Silverado 2500HD / 3500HD with 6.6L L5P Duramax
- 2020, 2021, 2022, 2023 GMC Sierra 2500HD / 3500HD with 6.6L L5P Duramax
- GM 6.6L Duramax L5P platform only (not compatible with earlier LML or previous Generation L5P engines)
This kit is designed for factory‑equivalent replacement of contaminated fuel system components after a CP4 failure, water‑in‑fuel event, or DEF‑in‑fuel incident.
Shop‑Friendly Features & Warranty
- Alliant Power 3‑year / unlimited‑mileage warranty on fuel system components when installed correctly
- Complete kit shipped from NorCal Diesel Performance in Orangevale, CA—fast processing for local shops and nationwide customers
- Designed to reduce diagnostic guesswork: if your truck has confirmed HP4 contamination or a failed injection pump, using this kit minimizes the risk of repeat failures versus piecing together used or mismatched parts
When You Need the Alliant Power L5P Fuel Contamination Kit
The Alliant Power AP54822 kit is ideal for:
- Confirmed HP4 pump failure where metal debris has circulated through the fuel system
- Water or contamination in the fuel tank causing repeated injector or fuel rail issues
- Accidental DEF‑in‑fuel incidents that have damaged the fuel injection system
- Engine performance issues such as hard starts, loss of power, or rough idle after a suspected contamination event
If you’re seeing multiple failed fuel filters, metal flake on filters, or repeated injector issues, a complete contamination kit is the best way to clear the entire fuel pathway and give your customers a reliable long‑term fix.
Order Your L5P Fuel Contamination Kit from NorCal Diesel Performance
When you need a complete, shop‑trusted solution for CP4 contamination repairs on 2020–2023 Chevy & GMC Duramax trucks, the Alliant Power L5P Fuel Contamination Kit from NorCal Diesel Performance is the most efficient way to get your customer back on the road without fear of repeat failures. Based in Orangevale, CA, we support diesel shops and DIY’ers across the United States with fast shipping, technical guidance, and an Alliant‑backed warranty on every kit.
Shop the Alliant Power L5P Fuel Contamination Kit AP54822 for 2020–2023 GM 6.6L Duramax today.
Features and Benefits:
- 3 year, Unlimited mile warranty
- 100% Genuine OE or OE equivalent and validated components
- Each fuel system component is 100% end of line test at 15 different points to ensure zero leaks and peak performance
- One convenient kit that includes all necessary components to do a fuel system replacement
- USA assembled and built proudly in an ISO 9001:2015 certified facility
Includes in the Box:
- 8x Remanufactured Common Rail Injector OE# 12698552
- 1x Remanufactured Common Rail Pump OE# 12731367
- 1x Throttle Body Gasket
- 1x EGR Gasket
- 1x Turbocharger Air Inlet Adapter Seal
- 2x Upper Intake Manifold Seals
- 2x EGR Gasket Cooler Gasket
- 2x Coolant Thermostat Housing Gasket
- 1x EGR Coolant Feed Pipe Seal
- 1x Diesel Fuel Filter Element-Metal Free
- 1x Fuel Injection Fuel Return Pipe
- 1x Fuel Injection Fuel Return Pipe LH
- 1x Fuel Injection Fuel Return Pipe RH
- 1x Coolant By-pass Pipe Gasket
- 1x Thermostat Bypass Pipe Seal
- 1x Fuel Cooler
- 1x EGR Pipe Gasket
- 1x EGR Pipe Gasket
- 1x Fuel Injection Pump Nut
- 1x Left Hand Fuel Rail
- 1x Right Hand Fuel Rail
- 1x Fuel Feed & Return Line Set
- 4x Cylinder 2/4/5/7 Rail To Injector Line
- 4x Cylinder 1/3/6/8 Rail To Injector Line
- 1x Low Pressure Diesel Hydrocarbon Injector
- 1x High Pressure Fuel Line
- 1x High Pressure Fuel Line
- 8x Fuel Injector Hold Down Bolt
Cross Reference
Replaces the following part numbers
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