Doc's Diesel Fuel/Water Separator for RAM 6.7L Cummins DGF401 — 2010-2025 Fit, 3‑Micron High‑Efficiency Filtration

This high-efficiency replacement filter protects the fuel system by separating water and trapping particles down to a 3-micron rating, helping maintain reliable injector performance and steady fuel pressure. Built to match OE fitment and service intervals, the DGF401 swaps in for Mopar 68157291AA and several aftermarket equivalents, and includes the necessary O-rings for a proper seal.

How does this separator protect my Cummins diesel fuel system?

The DGF401 forces fuel through specialized filtration media that captures dirt, rust, and other debris while allowing separated water to collect and be drained away. Removing these contaminants reduces wear on high-pressure pumps and injectors and helps preserve fuel-system components.

• 3-micron filtration rated at 96.92% efficiency for fine particle capture
• Media engineered to maximize surface area for longer service life
• Includes replacement O-rings to prevent leaks and ensure correct sealing

Will the DGF401 fit my RAM 2500/3500/4500/5500 with a 6.7L Cummins?

Yes—the DGF401 is designed to be compatible with RAM 6.7L Cummins models from 2010 through 2025 listed for 2500, 3500, 4500, and 5500 chassis. It aligns with OEM mounting and thread patterns for a straightforward swap.

• Direct replacement for Mopar 68157291AA
• Cross-references: WIX 33255, FRAM CS11037, Baldwin PF9870, Premium Guard DF8606, Purolator F36294
• Includes necessary seals for proper installation and leak-free operation

How often should I replace the fuel/water separator?

Replacement intervals can vary based on driving conditions and fuel quality; follow your vehicle manufacturer’s recommendations as primary guidance. As a general practice, plan to change the separator between 5,000 and 10,000 miles, with 15,000 miles as an upper limit under lighter duty conditions.

• Inspect during routine service or when diagnostics indicate fuel-system issues
• Replace sooner if operating in dusty environments or with questionable fuel sources
• Always verify O-ring seating and torque on reassembly to avoid leaks

What performance testing supports this product's claims?

The DGF401 has been evaluated by independent third-party testing showing a 3-micron rating with a 96.92% efficiency figure, demonstrating substantial removal of fine particles. Those test results reflect the filter media’s ability to trap contaminants commonly found in diesel fuel while allowing adequate flow for engine needs.

• Third-party lab-tested micron rating and efficiency
• Engineered media for balance of filtration and fuel flow
• Designed to meet the demands of high-pressure fuel systems used in Cummins engines

Who is this for: Doc's Diesel DGF401 is aimed at RAM owners, fleet operators, and diesel technicians looking for an OE-fit, high-efficiency fuel/water separator for 6.7L Cummins trucks. If you need a reliable replacement that matches Mopar fitment, removes water and fine particulates, and includes the correct seals for installation, this filter is built for routine maintenance and heavy-duty use.