Genuine Mopar 68436631AA Fuel Water Separator Filter | OEM MO-631 for Ram 6.7L Cummins & 3.0L EcoDiesel

One filter, two elite engines, zero room for error. Whether you’re hauling heavy with a 2019+ Ram 6.7L Cummins or navigating trails in a 3.0L EcoDiesel Jeep, your fuel system demands absolute purity. The Genuine Mopar 68436631AA (MO-631) is the factory-specified frame-mounted separator engineered to stop water and debris in their tracks before they reach your high-pressure injectors.

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🧠 WHY THIS MATTERS

At Valtrix Powertrain, we know that modern diesel systems operate at pressures exceeding 30,000 PSI. At these levels, even a single drop of water can cause "tip-blowout" in an injector. The MO-631 is built with proprietary filtration media that specifically targets emulsified water—the kind that budget aftermarket filters often miss. Using this OEM kit isn't just maintenance; it’s protecting your engine's warranty and its long-term reliability.

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🆚 OEM vs AFTERMARKET

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📦 WHAT’S INCLUDED

• (1) Genuine Mopar Fuel Water Separator Filter (P/N 68436631AA / MO-631)

• (1) Factory-Spec Sealing O-Ring

• Mopar Official Protective Packaging

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⚙️ COMPATIBILITY

This is the frame-mounted (rear) fuel filter for 2019+ Heavy Duty trucks and 2020+ EcoDiesel models.

• Ram 2500/3500/4500/5500: 2019, 2020, 2021, 2022, 2023, 2024+ (6.7L Cummins)

• Ram 1500: 2020, 2021, 2022, 2023 (3.0L EcoDiesel)

• Jeep Wrangler JL: 2020, 2021, 2022, 2023 (3.0L EcoDiesel)

• Jeep Gladiator JT: 2021, 2022, 2023 (3.0L EcoDiesel)

• Interchange: MO-631, 68436631AB.

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🚨 SIGNS YOU NEED THIS

Replace your MO-631 immediately if you experience:

• Dashboard Warning: "Water in Fuel" light is active.

• Fuel Starvation: Engine stutters under heavy acceleration or towing.

• Milestone Service: You have reached 15,000 miles (standard) or 10,000 miles (severe duty).

• Rough Idle: Inconsistent RPMs at stoplights after a recent fill-up.

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🛒 WHY BUY FROM VALTRIX

• Verified Authenticity: Don't gamble with "Amazon Fakes." We ship 100% genuine Mopar parts.

• In-Stock & Ready: We keep our inventory live so your truck isn't sitting on jack stands.

• Expert Knowledge: We specialize in Cummins and EcoDiesel powertrain components.

• Secure Logistics: Fast, tracked shipping across the USA.

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Keep your diesel system pure. Ensure your high-pressure fuel pump stays lubricated and water-free with the factory's own solution. 👉 [ADD TO CART] and maintain the peak performance of your Ram or Jeep.

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❓ FAQ

Q: Is this the same as the 68197867AB? A: No. The 68436631AA (MO-631) is for 2019 and newer Ram trucks. If your truck is a 2013–2018 model, you likely need the 68197867AB. Always check your model year!

Q: Where is this filter located? A: On Ram trucks, this is the frame-mounted filter located in the rear, near the fuel tank. On Jeep EcoDiesel models, it is located near the middle of the chassis.

Q: Should I change the engine-mounted filter at the same time? A: Absolutely. To ensure 100% fuel system integrity, Mopar recommends changing both the engine-mounted filter and this frame-mounted separator at every service interval.