Racor PFF4245R2-02 ParFit Fuel Filter Head Assembly — Direct Replacement for 2004.5–2016 GM 6.6L Duramax LLY | LBZ | LMM | LML

The Racor PFF4245R2-02 ParFit Fuel Filter Head Assembly is the premium OEM-quality solution for your 2004.5–2016 Duramax diesel. Racor (Parker) is the original equipment manufacturer for GM’s fuel filter assembly, so this ParFit unit delivers factory fit, form, and function with upgraded reliability.

Why Replace the Entire Fuel Filter Head?

Factory Duramax filter heads commonly develop seal and O-ring leaks over time. These leaks cause hard starting, air intrusion, priming difficulties, fuel leaks, and poor drivability. Rebuilding the old head with new seals is often a temporary fix. The Racor ParFit assembly eliminates these headaches by giving you a brand-new, complete unit — no rebuilding required.

Key Features & Benefits

• Complete direct-replacement assembly — Includes the heated filter head, new high-performance filter element, 12V fuel heater, hand primer pump, water-in-fuel (WIF) sensor, and drain valve.
• Superior 4-stage Racor filtration — Aquabloc® media provides exceptional water separation (up to 99% efficiency) and particle removal. Delivers up to twice the service life of standard pleated media filters and is biodiesel compatible.
• Built-in fuel heater — Helps prevent gelling and improves cold-weather performance.
• Easy priming — Integrated hand primer pump makes post-service priming quick and simple.
• OEM fitment — Bolts in place with no modifications on properly matched vehicles. Replaces GM part # 12642623.

Vehicle Fitment

2004.5–2016 GM 6.6L Duramax (LLY, LBZ, LMM) Important: 2004 was a split model year. Verify the 8th digit of your VIN:

• “2”, “D”, or “6” → Use PFF4245R2-02 (this part)
• “1” (2001–early 2004 LB7) → Use PFF4245R2-04 instead

Note: Can be adapted to some later LML models by extending fuel lines (verify fitment for your specific truck).

Specifications

• Max Flow Rate: ~50 GPH
• Micron Rating: High-efficiency 2–4 micron media
• Ports: 1/2″ hose barb inlet/outlet
• Includes: Complete heated head assembly + new filter element
• Replacement Filter Element: PFF50216 (available separately)

Why Choose the Racor ParFit Assembly?

You get genuine Racor engineering and quality at a competitive price — the same trusted brand GM chose as the OEM supplier. It’s the cleanest, most reliable way to restore proper fuel filtration and eliminate the common leak and priming issues that plague aging Duramax trucks.

This is an excellent upgrade or replacement for any 2004.5–2016 Duramax owner experiencing fuel system issues or performing preventive maintenance.

Pro Tip: Always replace the fuel filter element at recommended intervals and keep a spare PFF50216 on hand for quick service.