Doc's Diesel Fuel/Water Separator for 6.7L Cummins RAM 2500–5500 (2025–2026) — Matched Assembly, 3‑Micron Efficiency

This fuel/water separator from Doc's Diesel (DGF431) is engineered to protect the fuel system on late-model RAM trucks with the 6.7L Cummins engine. Independently tested components in this product family show high efficiency at capturing particles down to 3 microns. The unit is sold as a matched assembly so you get the correct parts for a single service interval, and the listing includes a fitment card to confirm compatibility for your specific year and configuration before purchase.

How does this separator protect my truck's fuel system?

The separator removes free and emulsified water and captures dirt, rust, and debris before they reach injectors and pumps. Cleaner fuel reduces wear on high-pressure components and helps maintain reliable engine operation under heavy loads.

• High-efficiency media: tested to 99.1% (DGF430) and 93.48% (DGF401) at 3 microns for comparable components.
• Water trapping: designed to separate and drain free water away from the fuel stream.
• Contaminant capture: collects rust, sediment, and particulates to protect precision fuel system parts.

Will this fit my RAM 6.7L Cummins truck?

The DGF431 assembly is built specifically for RAM 6.7L Cummins models from 2025–2026, including 2500, 3500, 4500, and 5500 series. Always check the fitment card on the product page against your truck's year and configuration to ensure exact compatibility before ordering.

• Fits 6.7L Cummins engines in RAM 2500–5500 for model years 2025–2026.
• Includes matched components so one purchase covers a complete service.
• Refer to fitment card to confirm cab, drivetrain, and factory equipment specifics.

How often should I change this fuel/water separator?

Service intervals vary by driving conditions and manufacturer guidance; changing the separator every 5,000–10,000 miles is a common recommendation, with 15,000 miles as a maximum interval. Inspect the separator during routine maintenance and replace sooner if you find visible contamination or water in the bowl.

• Typical replacement window: 5,000–10,000 miles for routine use.
• Maximum recommended: 15,000 miles unless manufacturer advises otherwise.
• Check for water or heavy debris and change immediately if present.

What comes in the box and how does it install?

The DGF431 is sold as a matched assembly, so each order contains the components needed to complete a single service for the specified application. Installation follows OEM mounting and drain procedures; it’s compatible with factory fuel/water separator housings on compatible RAM trucks.

• Included: DGF431 fuel/water separator assembly with matched parts for one service.
• Designed for drop-in replacement using existing OEM mounting points and fittings.
• Follow vehicle manufacturer instructions for draining and priming during installation.

Who is this for? This Doc's Diesel DGF431 fuel/water separator is intended for owners and technicians of 2025–2026 RAM trucks equipped with the 6.7L Cummins engine who want a high-efficiency, vehicle-specific replacement part. It’s suited for fleet managers, diesel enthusiasts, and anyone performing scheduled fuel system maintenance who needs tested contaminant and water control delivered as a matched service kit.