Description
Complete Fuel Filter Assembly for 2013-2018 Ram 6.7L Cummins Turbo Diesel
Your Ram HD's 6.7L Cummins is built to work hard, but the CP4.2 high-pressure fuel pump doesn't tolerate contamination. When the factory fuel filter assembly develops cracks, leaks, or internal seal failures, unfiltered fuel reaches the injection system — and the repair bill can exceed $8,000 for a complete fuel system replacement. This direct-fit fuel filter assembly replaces the entire factory housing and cartridge with a precision-engineered unit that matches or exceeds OEM specifications at a fraction of dealer pricing.
Key Features
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Complete Assembly: Includes filter housing, new cartridge-style fuel filter, water-in-fuel sensor port, and all integrated seals — ready to bolt on right out of the box.
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OE-Grade Filtration: Multi-layer filter media captures particles down to 4 microns absolute, protecting the CP4.2 injection pump and piezo injectors from abrasive wear.
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Water Separation: Integrated water-in-fuel detection port works with your factory WIF sensor to alert you before water reaches the injection system and causes catastrophic corrosion.
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Direct Fitment: Precision-molded mounting points and port locations match the factory plumbing exactly — no modifications, no adapter fittings, no headaches.
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Cost-Effective Protection: A fraction of the OEM assembly cost — an affordable insurance policy against a four-figure fuel system repair.
Vehicle Compatibility
| Make |
Model |
Years |
Engine |
| Ram |
2500 |
2013-2018 |
6.7L Cummins Turbo Diesel |
| Ram |
3500 |
2013-2018 |
6.7L Cummins Turbo Diesel |
| Ram |
4500 |
2013-2018 |
6.7L Cummins Turbo Diesel |
| Ram |
5500 |
2013-2018 |
6.7L Cummins Turbo Diesel |
Technical Specifications
| Specification |
Value |
| Part Type |
Fuel Filter Housing Assembly (Complete) |
| Filter Media |
Cellulose/Synthetic Blend, Multi-Layer |
| Filtration Efficiency |
99% @ 4 microns absolute |
| Water Separation |
>95% efficiency |
| Housing Material |
High-Grade Nylon Composite |
| Includes Filter |
Yes — New Cartridge-Style Element Pre-Installed |
| WIF Sensor Port |
Yes — Compatible with Factory Sensor |
| Replaces OEM |
68157290AB, 68157291AA |
Why Replace the Complete Assembly?
On 2013-2018 Ram Cummins trucks, the factory fuel filter housing is a known trouble area. The plastic housing can develop hairline cracks at the mounting tabs from engine vibration, the internal bypass valve seat can wear and allow unfiltered fuel past the element, and the water drain petcock threads often strip after a few service cycles. Rather than chasing individual component failures, replacing the complete assembly restores the entire filtration system to factory spec in one service. It's the smart move whether you're doing preventive maintenance or troubleshooting a fuel pressure issue.
Installation Tips
- Depressurize the fuel system by removing the fuel pump relay and cranking the engine briefly before disconnecting any lines.
- Clean the mounting surface thoroughly — any debris trapped between the housing and bracket can cause uneven clamping and eventual cracking.
- Torque mounting bolts to 89 in-lbs — over-tightening is the #1 cause of cracked housings on these trucks.
- Prime the system by cycling the key to "Run" (without starting) 3-4 times — each cycle runs the in-tank lift pump for ~25 seconds.
- Inspect the WIF sensor O-ring before installation and apply a thin film of clean diesel fuel to prevent pinching during insertion.
Frequently Asked Questions
Q: Do I need to replace the water-in-fuel sensor when replacing the assembly?
A: Not necessarily. The factory WIF sensor can be transferred from your old housing to the new one. However, if your sensor is more than 5 years old or you've had water contamination issues, it's good practice to replace it. The sensor O-ring should always be replaced.
Q: Will this fit my 2019+ Ram with the CP4.2 pump?
A: No, 2019 and newer Ram HD trucks use a different fuel filter housing design. This assembly is specifically for 2013-2018 models. Please verify your vehicle's production date before ordering.
Q: How often should I replace the fuel filter after installing this assembly?
A: Ram recommends every 15,000 miles (24,000 km) or 12 months under normal conditions. If you tow heavy, operate in dusty environments, or use biodiesel blends above B5, reduce the interval to 10,000 miles.
Q: Can I use this with aftermarket lift pumps?
A: Yes, this assembly is compatible with aftermarket lift pump systems (FASS, AirDog, Airdog II, etc.) as long as fuel pressure at the filter inlet does not exceed 15 PSI. If you're running a higher-pressure lift pump, install a pressure regulator upstream of the filter assembly.
