Later-model Ram 6.7L Cummins trucks use a dual-filter arrangement that should be serviced with the correct model-year-specific components. A kit intended for an earlier truck may include one familiar-looking filter while using the wrong fuel and water separator for the later chassis-mounted housing.
This guide focuses on the 68157291AA and 68436631AA combination listed for 2019–2024 Ram 2500, 3500, 4500, and 5500 applications. It covers kit contents, fitment checks, differences from the earlier configuration, installation preparation, priming, and post-service inspection.
What the two-filter kit contains
The product listing describes a complete set with:
- One engine-mounted fuel filter
- One chassis-mounted fuel and water separator filter
- Two replacement O-rings
The engine-mounted element adds filtration before fuel reaches sensitive system components. The chassis-mounted separator helps manage water and contamination earlier in the fuel path. Both filters should be identified correctly because they are different parts installed in different locations.
The Vypart 68157291AA and 68436631AA fuel filter/water separator kit is listed for compatible 2019–2024 Ram 6.7L Cummins Turbo Diesel trucks. It is an aftermarket replacement set and should be verified against the vehicle and original filters before purchase.
Listed vehicle applications
The Vypart page lists these applications:
- 2019–2024 Ram 2500 with 6.7L Cummins Turbo Diesel
- 2019–2024 Ram 3500 with 6.7L Cummins Turbo Diesel
- 2019–2024 Ram 4500 with 6.7L Cummins Turbo Diesel
- 2019–2024 Ram 5500 with 6.7L Cummins Turbo Diesel
Reference numbers include 68157291AA, 68436631AA, 68065608AA, and PF46152. Model year, engine, filter configuration, and original part references should all agree. The truck model or engine size alone is not enough.
How the later kit differs from the 2013–2018 combination
The key comparison is the chassis-mounted fuel and water separator. The 2019–2024 listing uses 68436631AA, while the earlier 2013–2018 listing identifies the 68197867AA/AB-style separator.
Because one portion of the dual-filter system may look similar across years, buyers sometimes compare only the engine-mounted filter. Always compare the complete two-filter set. If either filter, cap, seal, sensor interface, or housing shape differs, verify the application before installation.
A six-point pre-order fitment check
Use this checklist before adding a kit to the cart:
- Model year: Confirm the truck falls within the listed 2019–2024 range.
- Vehicle: Confirm it is a Ram 2500, 3500, 4500, or 5500.
- Engine: Confirm the 6.7L Cummins Turbo Diesel application.
- Part numbers: Compare the original filters or trusted service records with 68157291AA and 68436631AA references.
- Physical configuration: Compare filter shapes, caps, sealing surfaces, and any reusable components.
- Package contents: Confirm both filters and the required replacement O-rings are present before starting work.
If the truck has been modified or its maintenance history is unclear, verify the current housings and removed filters rather than relying only on the VIN description.
Prepare for clean fuel-system service
The area around a chassis-mounted separator can collect road dust, mud, and moisture. Clean the outside thoroughly before opening it. The engine-mounted housing also needs a clean perimeter so loose debris cannot enter.
Prepare an approved container for drained diesel fuel and water. Keep the new filters in clean packaging until each housing is ready. Use lint-free materials and tools that are free from dirt, metal particles, or chemical residue.
The service manual should be open to the procedure for the exact truck. Review access requirements, drain steps, cap removal, seal locations, tightening specifications, priming, and leak checks before the first part is removed.
General replacement sequence
The vehicle-specific procedure takes priority, but a disciplined workflow usually follows this order:
- Compare both replacement filters with the original configuration.
- Clean the chassis-mounted and engine-mounted filter areas.
- Drain the separator or housing according to the service instructions.
- Remove each filter without allowing exterior debris into the open system.
- Remove the old seals and inspect every groove and mating surface.
- Prepare and install the new O-rings exactly as specified.
- Seat the new filters in the correct orientation.
- Reassemble the housings and tighten them using the specified method.
- Prime the fuel system using the truck's documented procedure.
- Start the engine and inspect both locations for fuel leakage.
Avoid touching clean filter media with dirty gloves. If an O-ring rolls, twists, or pinches during assembly, remove it and inspect it before proceeding.
Common service mistakes
Ordering the earlier separator
A 2013–2018 separator should not be selected just because the truck has the same engine displacement. Use the later 68436631AA reference as one of several fitment checks for the listed 2019–2024 application.
Reusing seals
The product listing includes two replacement O-rings. Old rings can be compressed or damaged even when they appear intact. Replace seals as directed and confirm the old rings have been completely removed.
Installing an O-ring in the wrong groove
A cap may still thread into place with a misplaced seal, but the assembly may leak. Compare the old arrangement with the service diagram and inspect the groove before tightening.
Priming by guesswork
Use the vehicle's specified priming process. Do not rely on extended cranking to pull fuel through an empty system. If the engine does not start after proper priming, stop and inspect the work.
Checking only the engine bay
The second service location is on the chassis. A complete leak inspection must cover both the engine-mounted housing and the chassis-mounted separator.
What to check after the engine starts
Observe both housings from a safe position while the engine runs. Look for dampness, drips, or fresh fuel odor. Confirm that caps, drains, and connectors remain secure. If a leak appears, shut the engine off and correct it before driving.
After a short test drive, park safely and inspect both areas again. Delayed seepage may become visible only after the system has operated.
Match the entire filter system to the truck
The correct kit is determined by the complete vehicle and filter configuration—not just the words “Ram” and “6.7L Cummins.” Confirm the later model-year range, both part references, physical filter design, and seal arrangement before purchase.
Visit the Vypart fuel and motor oil collection to compare the later Ram kit with the earlier Ram and Ford Power Stroke service options.
Safety note: Diesel fuel is combustible, and fuel-system work can involve hot components, retained fuel, and vehicle lifting. This article is general information only. Follow the manufacturer’s service instructions and consult a qualified diesel technician when fitment or installation is uncertain.