Engineered specifically for 2001 through 2010 Chevrolet Silverado and GMC Sierra 2500HD/3500 trucks powered by the 6.6L Duramax V8 turbo diesel engine across LB7, LLY, LBZ, and LMM generations, the Fleece Performance Fuel Pressure Regulator (FPR) Wiring Harness (Part # FPE-HAR-DMAX-FPR) provides a direct plug-and-play replacement for brittle, heat-damaged, or corroded factory injector pump regulator pigtails.

Constant under-hood thermal cycling and oil exposure frequently degrade the factory electrical connector leading to the injection pump regulator, causing erratic fuel rail pressure control, rough idles, engine misfires, and permanent diagnostic trouble codes (DTCs). Fabricated using fully automated wire-cutting and terminal-crimping processes, Fleece replacement harnesses restore reliable electrical continuity with zero core charge.

Key Features & Benefits

• Direct Plug-and-Play Replacement: Eliminates hours of tedious wire tracing, cutting, and soldering by swapping directly into factory connector routing.
• OEM-Quality Weather-Pack Connectors: Features high-temperature housing and tight rubber weather seals to prevent moisture intrusion and oil degradation.
• Automated Precision Criminative Terminals: Manufactured in-house using automated equipment to ensure maximum pull-out strength and resistance to engine vibration.
• Cures Common Fuel Rail Codes: Solves intermittent rail pressure control issues caused by high-resistance factory pigtails and corroded pins.
• Zero Core Charge: Brand-new outright replacement wiring harness requiring no core deposit or core return shipping.

Technical Specifications

• Manufacturer / Brand: Fleece Performance Engineering
• Manufacturer Part Number / SKU: FPE-HAR-DMAX-FPR
• Product Type: Fuel Pressure Regulator (FPR) / Injection Pump Pigtail Harness
• Automotive Wire Grade: High-Temperature TXL Cross-Linked Polymer Wire
• Truck Platform: 2001–2010 GM 2500HD / 3500 Silverado & Sierra
• Engine Platform: 6.6L Duramax V8 Turbo Diesel (LB7, LLY, LBZ, and LMM Codes)
• Core Requirement: None
• Warranty: Fleece Performance Limited Warranty

Vehicle Fitment & Technical Installation Notes

• 2001–2004 GM 2500HD / 3500 Duramax 6.6L – LB7
• 2004.5–2005 GM 2500HD / 3500 Duramax 6.6L – LLY
• 2006–2007 GM 2500HD / 3500 Duramax 6.6L – LBZ (Classic Body)
• 2007.5–2010 GM 2500HD / 3500 Duramax 6.6L – LMM
• Installation Tip: Disconnect the negative battery terminals before beginning electrical service. Snip the damaged factory pigtail back from the main engine harness, strip the leads, and connect the Fleece FPE-HAR-DMAX-FPR harness securely using heat-shrink solder connectors or professional crimp-and-seal terminals to protect against under-hood moisture and oil contamination.