DOC'S Diesel Fuel/Water Separator for Ram 6.7L Cummins (2019–2022) – Replaces 68436631AA | OEM Grade

Keep your Ram 6.7L Cummins fuel system clean

Doc's Diesel Fuel/Water Separator for the Ram 6.7L Cummins is engineered to keep moisture out of the fuel line and to trap dirt, rust, and debris before they reach critical components. In everyday driving, you may notice steadier fuel delivery and smoother starts as the fuel path stays clear, whether you’re maneuvering through city traffic or cruising on the highway.

Designed to maximize the surface area of its filtration media, this unit works with an included o ring set to seal the housing securely. The result is a compact, OEM grade filter that slides into your existing fuel system with a direct replacement path and predictable fitment.

What to expect from this separator

• Water separation from fuel plus filtration of common contaminants helps protect fuel system parts.
• Maximized filtration media surface area supports consistent filtration performance over time.
• 3 micron filtration rated at 96.92% efficiency, third‑party tested for reliability.
• O rings are included for a complete, leak‑resistant seal during installation.

Interchangeability and compatibility

This unit replaces Mopar 68436631AA and works as a direct swap for multiple brands, offering a flexible upgrade path. It also aligns with a broad interchange including Wix, Baldwin, Premium Guard, and Purolator lines.

• Interchanges: Mopar 68436631AA, Wix WF10579, Baldwin PF46152, Premium Guard DF99569, Purolator F51543.
• Fitment: 2019–2022 Ram 6.7L Cummins 2500, 3500, 4500, 5501 trucks.

Installation and replacement guidance

For best results, follow your vehicle manufacturer warranty and replacement guidelines. Common practice suggests changing the separator every 5,000 to 10,000 miles, with a maximum interval of 15,000 miles between changes depending on use and fuel quality.

Why choose this OEM grade separator

Choosing an OEM grade fuel/water separator balances filtration efficiency with ease of use. It supports reliable fuel delivery and can contribute to smoother operation under varying driving conditions. Benefits are possibilities, not guarantees, and will depend on vehicle condition and driving patterns.