Doc's Diesel Fuel/Water Separator DGF430 for Ram 6.7L Cummins (2019+) | Replaces 68436631AA

Doc's Diesel Fuel/Water Separator DGF430 is engineered to help keep your Ram 6.7L Cummins diesel cleaner on the road. By separating water from fuel and catching contaminants such as dirt, rust, and debris, this separator aims to protect fuel system components and support consistent engine performance across daily trips, highway driving, and demanding trailer work. The unit is designed to maximize filtration media surface area, which can translate to steadier fuel flow and sustained pressure under load. In everyday use, this means drivers may experience smoother starts, more confident acceleration, and more predictable engine response when climbing grades or towing a load.

Key benefits stem from a focused filtration approach paired with solid build and clear interchange potential. The DGF430 is third‑party tested with a 3 micron filtration rating at 96.92% efficiency, indicating a strong capability to reduce microscopic contaminants before they enter the fuel pump and injectors. With o‑rings included, the replacement kit is designed for a reliable seal during service, helping to minimize fuel leaks and maintain proper system pressure. Combined with its interchangeability, the unit serves as a versatile upgrade or replacement for several compatible brands.

Interchange and fitment

• Interchanges: Mopar 68436631AA, Wix WF10579, Baldwin PF46152, Premium Guard DF99569, Purolator F51542.
• Fitment: 2019–2024 Ram 6.7L Cummins 2500, 3500, 4500, 5500 models.
• Brand-tested filtration: 3 micron rating with a high efficiency claim, providing strong defense against water and fine particulates.

Replacement guidance for long-term reliability

• Follow your vehicle manufacturer warranty guidance for replacement intervals.
• Recommended change window: roughly every 5,000 to 10,000 miles, with a maximum stretch around 15,000 miles.
• Regular replacement helps maintain optimal fuel flow and pressure, supporting consistent engine performance.

In practice, drivers may notice that clean fuel delivery contributes to steadier performance in daily driving, smoother idling, and more predictable response when towing or hauling. While results can vary by vehicle usage and conditions, choosing a robust fuel/water separator like the DGF430 can be a practical step toward maintaining fuel system integrity and protecting downstream components over time.