If you own a RAM 2500 or 3500 equipped with the 6.7L Cummins diesel engine, you already know how important fuel system maintenance is. One of the key components in this system is the 68157291AA fuel filter—a part you can’t afford to overlook. Whether you’re doing a routine service or solving fuel delivery issues, this guide will walk you through everything you need to know about this specific Mopar filter.
From fitment to replacement tips, and even how it compares with the CCV filter 6.7 Cummins, we’ve got it covered.
What Is the 68157291AA Fuel Filter?
The 68157291AA is an OEM-grade diesel fuel filter manufactured by Mopar, specifically designed for RAM trucks powered by the 6.7L Cummins engine. This filter isn’t just a small maintenance item—it’s a frontline defense that protects your fuel injectors from dirt, water, and other contaminants.
It also features a water separation system, ensuring cleaner combustion and extending the lifespan of your diesel engine components. If you're serious about protecting your Cummins, this filter should be at the top of your service checklist.
Which RAM Models Use the 68157291AA?
The 68157291AA fuel filter fits a wide range of RAM trucks, including:
- RAM 2500 (6.7L Cummins) – Model years 2013 to 2018+
- RAM 3500 (6.7L Cummins) – Model years 2013 to 2018+
- Some RAM 4500/5500 chassis cab models
Note: RAM trucks manufactured after 2019 may use a different updated filter (e.g., 68436631AA), so it’s a good idea to verify compatibility using your VIN or consult your owner’s manual.
Why Regular Fuel Filter Replacement Matters
Diesel engines are extremely sensitive to fuel quality. Contaminated diesel can cause:
- Injector failures
- Reduced power
- Hard starts
- Decreased fuel efficiency
Replacing the Mopar 68157291AA filter helps ensure that only clean fuel reaches your combustion chambers. If you’ve noticed sluggish performance or suspect poor fuel economy, this is one of the first components you should check.
Recommended Replacement Interval:
- Every 15,000 miles, or sooner if driving in dusty or harsh environments
Step-by-Step: How to Replace the 68157291AA Fuel Filter
Replacing the 68157291AA fuel filter yourself can save you time and money. Here’s a simplified walkthrough:
Tools Needed:
- Mopar 68157291AA filter
- Socket wrench (28mm or oil filter wrench)
- Fuel-safe container for old diesel
- Rags or paper towels
- Gloves
Instructions:
- Park safely and ensure the engine is off and cool.
- Locate the filter – It’s mounted on the frame rail, under the driver’s side.
- Drain the old fuel from the filter using a catch can.
- Unscrew the filter cap using your wrench.
- Remove the old filter and O-ring.
- Install the new 68157291AA filter, making sure the new O-ring is seated properly.
- Tighten the cap until secure (avoid over-tightening).
- Prime the fuel system by turning the ignition to the ‘ON’ position (without starting) 2-3 times.
- Start the engine and check for any leaks.
Done! You’ve just completed a professional-level fuel filter replacement at home.
OEM vs Aftermarket – Is 68157291AA Worth It?
You might be tempted by cheaper aftermarket options, but there’s a reason Mopar filters are trusted by dealers and diesel experts.
Benefits of the Mopar 68157291AA:
- Designed specifically for 6.7L Cummins
- High-efficiency media for better filtration
- Long-lasting, OEM-certified materials
- Exact fit without leaks or compatibility issues
If reliability and performance matter, sticking to OEM is the smartest choice.
Final Thoughts
Whether you're a DIY enthusiast or rely on your mechanic, staying on top of fuel filter maintenance is essential for your RAM 6.7L Cummins. The 68157291AA fuel filter offers a perfect blend of OEM reliability and performance, making it one of the best fuel filter options available for this engine type.
Replacing it on time not only protects your fuel system but also improves performance, fuel efficiency, and engine longevity.
So the next time you’re under the hood (or under the truck), don’t overlook your 68157291AA—it’s a small investment with big returns.
