Your 2020 Ram 2500 or 3500 with a 6.7L Cummins diesel engine is built for power, towing, and reliability. But to keep it performing at its best, you need a high-quality fuel filter that protects the engine from fuel contamination and water intrusion. A proper diesel fuel filter system ensures clean fuel flow, better fuel economy, and long engine life — especially for truck owners across the USA, where diesel quality and driving conditions vary widely.
In this guide, we’ll cover the top 5 fuel filters for your 2020 Ram 6.7 Cummins, explain how to choose the right one, and share expert insights to help you maintain your truck like a pro.
What Does the Fuel Filter Do on a 2020 Ram 6.7 Cummins?
Your Ram 6.7 Cummins fuel filter is the first line of defense for your diesel engine. It removes dirt, rust, water, and debris before the fuel reaches the high-pressure common rail system and injectors. If you’re using low-grade diesel or frequently refueling at truck stops, contamination is a real risk.
A clogged or low-quality fuel filter can lead to hard starts, loss of power, poor fuel economy, and even injector damage — repairs that can easily cost thousands of dollars. That’s why serious U.S. truck owners invest in OEM Mopar fuel filters or trusted aftermarket diesel filter kits.
How Often Should You Replace the Fuel Filter on a 2020 Ram 6.7?
For most drivers in the United States, Ram recommends changing both primary and secondary fuel filters every 15,000 miles or 12 months, whichever comes first.
However, if you:
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Tow heavy trailers
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Drive in dusty or off-road environments
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Use biodiesel or lower-quality fuel
…it’s safer to change filters every 10,000–12,000 miles. Preventive maintenance keeps your Cummins 6.7L diesel fuel system running smoothly and prevents water and debris from damaging expensive components like the CP4 injection pump.
What Are the Best Fuel Filters for the 2020 Ram 6.7 Cummins?
Below are five top-rated options based on performance, fitment, and availability in the U.S. market.
1. Mopar OEM Fuel Filter Kit (Part #68157291AA / 68436631AA)
The Mopar OEM fuel filter kit is the factory-approved choice for 2019–2024 Ram 2500 and 3500 trucks with the 6.7L Cummins.
Why it stands out:
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Direct fit and guaranteed compatibility
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Meets factory micron rating and flow specs
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Designed for both primary and secondary filter housings
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Protects your truck’s warranty
This is the best option for truck owners who want OEM reliability, especially when servicing their Ram diesel fuel system under manufacturer warranty.
Pro Tip: Buy your Mopar kit from authorized U.S. sellers to avoid counterfeit parts.
2. Fleetguard / Cummins Genuine Filters
Fleetguard fuel filters are Cummins-branded and engineered to meet strict OEM specifications. Models like the FS53000 use NanoNet® media technology to trap even the smallest contaminants.
Benefits:
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Superior water separation and micron filtration
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Ideal for fleet and commercial applications
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Made in USA and trusted by heavy-duty operators
If you haul or tow frequently, Fleetguard is a professional-grade choice that outperforms many generic filters.
3. WIX / Baldwin Diesel Fuel Filter Kits
WIX and Baldwin are popular aftermarket alternatives known for value and availability. These kits include both the fuel/water separator and engine-mounted filter, making maintenance quick and affordable.
Why truck owners love them:
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Excellent filtration at a lower cost
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Compatible with OEM housings
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Easily available across U.S. auto stores and online retailers
They’re ideal for DIY mechanics and small fleet owners looking for reliable yet budget-friendly fuel filtration.
4. FASS / Airdog High-Performance Filtration Systems
If you’ve upgraded your truck or do heavy towing, a FASS diesel fuel system or Airdog lift pump kit adds next-level protection. These systems replace the factory filters with high-capacity spin-on filters that remove air, vapor, and water while improving fuel flow.
Advantages:
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2-micron filtration efficiency
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Longer filter life
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Increased horsepower and throttle response
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Ideal for U.S. drivers towing RVs, horse trailers, or heavy equipment
Performance truck owners in states like Texas or Colorado swear by these upgrades for long-haul reliability.
5. Baldwin / NAPA Gold (OEM Cross-Reference Kits)
Baldwin BF7967 and NAPA Gold 33960 are direct cross-references for the Mopar and Fleetguard filters used in the 6.7 Cummins.
Highlights:
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Excellent build quality
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Easy to find at major parts retailers
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Balanced price-to-performance ratio
For quick turnarounds or emergency service, these kits offer dependable filtration and easy installation.
Comparison Table: Best Fuel Filters for 2020 Ram 6.7 Cummins
How to Choose the Right Fuel Filter for Your Cummins Diesel
When choosing a fuel filter for your Ram 6.7, consider:
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Micron Rating – The lower the rating, the finer the filtration.
(2–5 microns is ideal for high-pressure diesel systems.) -
Water Separation – Look for filters that effectively separate and drain water.
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Compatibility – Verify it matches your truck’s VIN or OEM part number.
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Driving Conditions – For U.S. owners in dusty regions like Arizona or Utah, frequent replacement or higher-capacity filters are smart.
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Brand Reputation – Stick to Mopar, Fleetguard, WIX, Baldwin, or FASS to ensure quality.
How to Replace the Fuel Filters on a 2020 Ram 6.7 Cummins
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Relieve system pressure – Turn ignition to “ON” without starting to cycle the lift pump.
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Drain the water separator – Use the drain plug before removing the filter.
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Replace the primary filter (frame rail mounted).
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Replace the secondary filter (engine bay).
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Prime the system – Cycle ignition several times before starting.
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Inspect for leaks and warning lights.
Pro Tip: Always replace both filters at the same time to maintain balanced flow and pressure.
Why Quality Matters for U.S. Diesel Owners
American diesel often contains small amounts of water or impurities. A cheap filter can’t handle that. Using a high-quality diesel fuel filter and water separator prevents:
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Injector wear
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Pump failure
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Reduced MPG
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Starting issues in cold weather
For many U.S. Ram owners, especially those towing or hauling, spending a few extra dollars on a premium 6.7 Cummins fuel filter saves thousands in repairs later.
Signs Your Fuel Filter Needs Replacement
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Slow acceleration or hesitation
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Hard starting after sitting overnight
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Drop in fuel efficiency
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“Water in Fuel” (WIF) light on dashboard
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Unusual engine noise under load
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Noticeable power loss when towing
If you experience these symptoms, replace both filters immediately with a Mopar or Fleetguard kit.
Why Truck Owners Across the USA Trust Mopar & Fleetguard
Because they’re designed specifically for the Cummins 6.7L diesel, both Mopar and Fleetguard filters guarantee correct fit and flow. Unlike generic brands, they’re tested under U.S. conditions — from cold Midwest winters to hot Southwest summers. Whether you’re hauling in Texas, commuting in Florida, or off-roading in Colorado, OEM filters keep your Ram’s fuel system protected and efficient.
Final Thoughts
Your 2020 Ram 6.7 Cummins deserves a filter that matches its power and reliability. Whether you choose OEM Mopar, Fleetguard, or a WIX aftermarket kit, the key is regular replacement and using authentic components.
Clean fuel equals better performance, smoother idling, longer injector life, and stronger fuel economy. Protect your investment with the right filter — your Cummins engine will thank you.
FAQs
1. What’s the best fuel filter kit for a 2020 Ram 6.7 Cummins?
The OEM Mopar kit (68157291AA / 68436631AA) or Fleetguard FS53000 are the best all-around options for factory-level protection.
2. How often should I change the fuel filters?
Every 15,000 miles, or 10,000 miles for towing and harsh conditions across the USA.
3. Can I use WIX or Baldwin filters instead of Mopar?
Yes, as long as they meet OEM specifications and proper micron ratings. Always check part numbers before installation.
4. What happens if I don’t change my fuel filters?
Skipping replacements can cause fuel contamination, injector damage, or reduced performance especially in hot or humid U.S. regions.
5. Where can I buy genuine 2020 Ram 6.7 Cummins fuel filters?
From authorized U.S. retailers like Mopar dealers, Cummins distributors, and trusted online stores specializing in diesel fuel filter kits.
