Doc's Diesel Fuel/Water Separator DGF430+DGF401 - RAM 6.7L Cummins

In this review of Doc's Diesel Fuel/Water Separator DGF430+DGF401 the bottom line is simple: this two-piece replacement kit is best for owners of 2019-2024 RAM 6.7L Cummins trucks who want OEM-level filtration at a lower cost. The reviewer found the set effective at removing water, dirt and rust, and appreciated the included o-rings when present. Performance gains are practical rather than dramatic - the main reason to buy is reliable fuel-system protection that preserves injectors and maintains fuel pressure and engine response over long duty cycles.

Key Features

• Fuel and water separation: The filters are designed to trap water and particulate before they reach fuel system components, helping prevent injector damage and premature wear.
• Interchangeable fit: The DGF430 and DGF401 match common OEM and aftermarket cross references, so they fit 2019-2024 RAM 6.7L Cummins applications without modification.
• High filtration efficiency: Third-party testing shows a 3 micron media with about 96.92% efficiency, which targets fine contaminants that can affect fuel metering and combustion.
• Complete kit approach: The packaged set contains the two fuel/water separators needed for the replacement, reducing the chance of missing parts during service.
• Improves drivability: By optimizing fuel flow and pressure, the filters can help maintain acceleration response and steady fuel economy under load.

Who It's For

This kit is best for RAM 2500, 3500, 4500 and 5500 owners with the 6.7L Cummins from model years 2019 through 2024 who want a direct replacement for Mopar part numbers 68157291AA and 68436631AA without paying OEM pricing. It suits fleet trucks and heavy users who change filters on a routine 5,000 to 10,000 mile schedule or sooner under severe conditions.

Owners seeking OEM branding or a manufacturer warranty tied to dealer parts should look elsewhere; additionally, anyone who demands exact-match packaging or guaranteed included accessories should verify the presence of o-rings on arrival, as some customers reported missing plastic rings.

Pros & Cons

Pros

• Solid construction and good fit that matches OEM dimensions for easy installation.
• High filtration efficiency at 3 micron helps protect injectors and maintain performance.
• Cost-effective alternative to OEM parts with included separators to complete the job.

Cons

• Occasional reports of missing o-rings require buyers to double-check the kit before installation or keep spares on hand.

Specifications

Brand	Doc's Diesel
Compatible Engines	RAM 6.7L Cummins 2019-2024
Included Parts	(2) Fuel/Water Separators DGF430 + DGF401
OEM Cross References	Replaces Mopar 68157291AA and 68436631AA
Filtration Rating	3 micron @ 96.92% efficiency
Recommended Change Interval	Every 5,000 to 10,000 miles (15,000 max)

Our Verdict

Doc's Diesel DGF430+DGF401 is a practical, value-oriented replacement for the RAM 6.7L Cummins fuel/water separators that provides near-OEM fit and strong particulate and water removal. It is a good buy for owners who perform regular maintenance and want reliable protection for fuel system components, though buyers should verify o-rings on delivery to avoid installation delays.

Frequently Asked Questions

Will these fit my 2020 RAM 3500 with the 6.7L Cummins?
Yes, the kit is specified for 2019-2024 RAM 6.7L Cummins 2500, 3500, 4500, and 5500 models and replaces the listed Mopar part numbers.

How often should I change these filters?
Follow manufacturer warranty guidance, with a practical schedule of every 5,000 to 10,000 miles and no more than 15,000 miles between changes under typical conditions.

Do the filters come with o-rings?
The product is supplied with o-rings as needed, but some customers reported missing plastic rings, so inspect the kit on arrival and keep spares if uncertain.