Doc's Diesel Fuel Water Separator for 6.7L Cummins RAM 2500 (2025–2026) — Direct-Fit, 3-Micron Filtration

Doc's Diesel Fuel Water Separator DGF431 is a direct-fit replacement designed to remove water and contaminants from fuel for 6.7L Cummins RAM 2500 (2025–2026) applications.

This fuel/water separator is engineered to protect your diesel fuel system by separating free water and filtering out particles that shorten injector and pump life. Built to match the OEM mounting and flow characteristics for RAM 6.7L Cummins models (2500, 3500, 4500, 5500) from 2025–2026, the DGF431 ships as a complete unit so you have every component needed for a single service. Independent testing shows high particulate-capture efficiency down to 3 microns on related Doc's Diesel models, and the assembly is intended to simplify routine maintenance intervals.

How does this separator protect my Cummins fuel system?

The separator isolates water from diesel and traps solid contaminants before they reach high-pressure components. By removing these contaminants, the assembly reduces the risk of corrosion and wear in pumps and injectors while helping maintain fuel delivery consistency.

• Separates free water from fuel to prevent corrosion and microbial growth.
• Traps dirt, rust and debris down to micron-sized particles.
• Protects high-pressure pumps and injectors by keeping fuel clean.
• OEM-style fit reduces installation errors and maintains fuel flow rates.

Will this unit fit my RAM 6.7L — what should I check before buying?

Doc's Diesel designed the DGF431 specifically for 6.7L Cummins RAM applications from model years 2025–2026, including 2500 and larger series. Confirm fitment with the vehicle fitment card on this product page and verify your engine and configuration before ordering to ensure compatibility.

• Compatible with RAM 2500, 3500, 4500, 5500 (6.7L) 2025–2026 models.
• Use the online fitment card to match exact year and options.
• Supplied as a matched assembly to replace your OEM separator directly.
• Installation follows factory routing and mounting points for an easier swap.

How often should I replace the DGF431 separator and what does service involve?

Replacement intervals vary by driving conditions and manufacturer recommendations, but the general guidance is to replace the fuel/water separator every 5,000–10,000 miles, with 15,000 miles being the outer limit in less-demanding conditions. Routine service typically involves draining collected water and swapping the entire separator assembly for a fresh unit.

• Recommended change every 5,000–10,000 miles; up to 15,000 miles maximum in light use.
• Inspect drain points regularly and remove accumulated water as needed.
• Replace the complete DGF431 assembly to ensure matched components and seal integrity.
• Follow your vehicle warranty and service schedule for official guidance.

What performance can I expect—how effective is the filtration?

Doc's Diesel separators are independently tested with strong micron-level performance on related models, providing high particulate capture and reliable water separation. While performance depends on fuel quality and conditions, the DGF431 is built to reduce contaminants that harm fuel-system components.

• High efficiency on particle capture when compared with comparable aftermarket options.
• Designed to remove free water and filter debris before fuel reaches high-pressure systems.
• Tested designs in the same product family show strong micron-level performance.
• Complete, application-matched unit helps retain proper flow and sealing.

Who is this for: Drivers and technicians who own RAM trucks with the 6.7L Cummins (2025–2026) and want an OEM-style, drop-in fuel/water separator to protect injectors and pumps during routine service. It suits fleet operators, off-road users, and any driver who prioritizes fuel-system longevity and straightforward maintenance with a matched replacement kit.