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Genuine Mopar 68157291AA Fuel Filter (MO-291) | OEM Engine-Mounted NanoNet® Filter for Ram 6.7L Cummins
Description
Don't let microscopic silt ruin your injectors. Your 6.7L Cummins uses a sophisticated two-stage filtration system, and the Genuine Mopar 68157291AA (MO-291) is your engine's final line of defense. This engine-mounted NanoNet® filter traps particles as small as 2 microns, ensuring only the purest diesel reaches your high-pressure common rail.
Technical Significance
Diesel performance is won or lost in the fuel system. The MO-291 isn't standard pleated paper — it uses advanced filtration media built to handle the high flow rates of the 6.7L Cummins without dropping pressure. A non-OEM filter in this location often leads to dry starts or "Fuel Rail Pressure Low" codes, problems you avoid entirely by sticking with the factory-certified Mopar standard.
OEM vs. Aftermarket Comparison
| Feature | Genuine Mopar 68157291AA (This Product) | Generic Aftermarket Filters |
|---|---|---|
| Micron Rating | 2-micron NanoNet® technology | Often 5–10 microns (allows damage) |
| Flow Rate | Optimized for Cummins high-pressure | Can cause fuel starvation under load |
| Housing Seal | Precision-molded for zero bypass | Poor fitment lets dirty fuel leak past |
| Service Life | Full 15,000-mile interval capacity | May clog prematurely or collapse |
Package Contents
- (1) Genuine Mopar engine-mounted fuel filter (Part #68157291AA / MO-291)
- (1) High-spec sealing O-ring
- Factory-sealed box — guaranteed original equipment
Vehicle Compatibility
The engine-mounted fuel filter for 2013–2024+ Ram Diesel trucks:
- Vehicle fitment: Ram 2500, 3500, 4500, 5500
- Engine: 6.7L I6 Cummins Turbo Diesel
- Model years: 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024
Interchange / Cross-Reference: 68157291AB, MO-291, 514316AC.
For 2013+ models, this works in tandem with the frame-mounted 68197867AB separator. We recommend replacing both at the same time.
Service Indicators
- Engine surging or hesitation at highway speeds
- Hard starting — prolonged cranking before the engine fires
- Black smoke or decreased fuel economy
- Service interval: 15,000 miles since your last fuel-system service
Not sure it fits? Send us your VIN or Engine Serial Number (ESN) and we'll confirm 100% compatibility before you buy. Brand new, factory-sealed, and shipped fast.
Recently viewed
Customer Reviews
5.0 / 5
★★★★★
Based on 1 review
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★★★★★ NanoNet media is in a completely different class
I've tried two different aftermarket MO-291 alternatives and both caused low fuel rail pressure codes within a month. Switched back to genuine Mopar 68157291AA and the codes never came back. The NanoNet synthetic fiber is clearly superior — you can see the difference just holding them side by side. Factory sealed, O-ring included. Not worth saving $10 on a fake.
Frequently asked questions
How do I know this part fits my vehicle?
Every listing includes a full compatibility list by make, model, year, and engine. If you're unsure, send us your VIN or Engine Serial Number (ESN) via the chat or contact page and we'll confirm fitment before you order.
Are these genuine OEM parts or aftermarket alternatives?
Every product we sell is 100% genuine OEM — factory-sealed and sourced directly from the manufacturer or authorized distributors. We do not sell aftermarket substitutes or white-box alternatives.
Do I need a professional to install these parts?
Most fuel filters and basic maintenance components are straightforward DIY installs with basic hand tools. We recommend consulting your vehicle's service manual for torque specs and bleed procedures. For ignition components and TPMS sensors, a relearn procedure may be required — see the product description for details.