Description
Product Overview
The Fuel Water Separator Filter is a direct replacement for the 2025-2026 Ram 2500, 3500, 4500, and 5500 heavy-duty trucks equipped with the 6.7L Cummins turbo diesel engine. This 5-micron absolute fuel filter replaces OEM 68677800AA and is the primary defense against water and particulate contamination that can destroy the CP4.2 high-pressure fuel pump. Includes new O-ring seals for leak-free installation.
Key Features
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5-Micron Absolute Filtration: Removes 99.9% of particulates ≥5 microns — critical for protecting the CP4.2 high-pressure fuel pump operating at 29,000+ PSI.
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Water Separation Technology: Hydrophobic media repels and coalesces water droplets, keeping them in the collection bowl where the WIF (Water-In-Fuel) sensor can detect them.
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Direct OEM Replacement: Identical dimensions, thread pitch, and sealing surface as Mopar 68677800AA. Drops into the factory filter housing with zero modifications.
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Complete Seal Kit: Includes replacement O-rings — critical because the OEM seals harden with heat cycling and can cause air intrusion if reused.
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CP4.2 Protection: Catastrophic CP4.2 pump failure is a $4,000-8,000 repair. This filter is your cheapest insurance policy.
Compatibility
| Year |
Make |
Model |
Engine |
Location |
| 2025-2026 |
Ram |
2500 |
6.7L Cummins |
Front Frame Rail (Under Driver) |
| 2025-2026 |
Ram |
3500 |
6.7L Cummins |
Front Frame Rail (Under Driver) |
| 2025-2026 |
Ram |
4500 |
6.7L Cummins |
Front Frame Rail (Under Driver) |
| 2025-2026 |
Ram |
5500 |
6.7L Cummins |
Front Frame Rail (Under Driver) |
Specifications
| Specification |
Value |
| Part Number |
FJ-00AA |
| OE Cross Reference |
68677800AA |
| Micron Rating |
5 Micron Absolute |
| Filter Media |
Cellulose/Synthetic Blend with Hydrophobic Treatment |
| Service Interval |
15,000 miles (Normal) / 10,000 miles (Severe) |
Frequently Asked Questions
Q: How often should I replace this fuel filter?
A: Ram recommends replacing the fuel water separator filter every 15,000 miles or every other oil change under normal conditions. For severe-duty use (heavy towing, biodiesel blends, dusty conditions), replace every 10,000-12,000 miles.
Q: Why is the fuel filter so critical on the 2025-2026 Cummins?
A: The 6.7L Cummins uses a Bosch CP4.2 high-pressure fuel pump that operates at up to 29,000 PSI. Any water or particulate contamination can destroy the pump ($4,000+ repair). The 5-micron fuel water separator is your first and most important line of defense.
Q: Does this include the water-in-fuel sensor?
A: No. This is the filter element only. The water-in-fuel sensor is integrated into the filter housing and does not need to be replaced during normal filter service — just unplug it during the change.
Q: Is this OEM or aftermarket?
A: This is a high-quality aftermarket filter manufactured to IATF 16949 standards, matching or exceeding the OEM 68677800AA filtration specifications. Same 5-micron absolute rating — same protection at a better price.
