Mopar 68436631AA Fuel/Water Separator Filter Kit MO-631

Mopar 68436631AA Fuel/Water Separator Filter Kit MO-631

$39.99
$39.99 $48.99
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Mopar 68436631AA Fuel/Water Separator Filter Kit MO-631
  • Mopar 68436631AA Fuel/Water Separator Filter Kit MO-631
  • Mopar 68436631AA Fuel/Water Separator Filter Kit MO-631
  • Mopar 68436631AA Fuel/Water Separator Filter Kit MO-631
  • Mopar 68436631AA Fuel/Water Separator Filter Kit MO-631
Mopar 68436631AA Fuel/Water Separator Filter Kit MO-631

Mopar 68436631AA Fuel/Water Separator Filter Kit MO-631

$39.99
$39.99 $48.99

The Mopar 68436631AA is a genuine OEM fuel/water separator filter designed for select Ram and Jeep diesel vehicles. It plays a crucial role in removing water and contaminants from diesel fuel, ensuring optimal engine performance and longevity.

Product Overview

  • Part Number: 68436631AA
  • Filter Type: Chassis-mounted fuel/water separator
  • Filtration Efficiency: Two-micron high-efficiency multi-layer depth filtration
  • Material: Synthetic fiber media
  • Weight: Approximately 8 oz
  • Location: Mounted near the fuel tank at the rear of the vehicle
  • Service Interval: Recommended replacement every 20,000–40,000 miles, depending on driving conditions 

 

Vehicle Compatibility

The Mopar 68436631AA fuel/water separator filter is compatible with the following vehicles:

  • Ram Trucks:

    • 1500 3.0L EcoDiesel (2020–2023)

    • 2500, 3500, 4500, 5500 6.7L Cummins Diesel (2019–2024)

     

  • Jeep Vehicles:

    • Wrangler JL 3.0L EcoDiesel (2020–2023)

    • Gladiator JT 3.0L EcoDiesel (2020–2023) 

Note: Always verify compatibility with your vehicle’s VIN or consult the owner’s manual to ensure proper fitment.


Cross Reference

The Mopar 68436631AA fuel/water separator filter can be cross-referenced with the following part numbers:

  • Baldwin: PF46152
  • Luber-Finer: L9768F
  • WIX: WF10579
  • NAPA: 300579
  • MicroGard: WF10579
  • Carquest: 96878 

Note: While these cross-references are compatible, it’s recommended to use the OEM Mopar 68436631AA filter for optimal performance.


Key Features

  • High-Efficiency Filtration: Two-micron rating ensures removal of fine contaminants, protecting the fuel system.
  • Water Separation: Effectively separates water from diesel fuel, preventing corrosion and injector damage.
  • Durable Construction: Synthetic fiber media provides long-lasting performance under various driving conditions.
  • OEM Quality: Meets or exceeds original equipment specifications, ensuring proper fit and function.

 

❓ FAQ

Q: Where is this fuel filter located, and which vehicles does it fit?

A: The Mopar 68436631AA is a chassis-mounted (rear) primary fuel/water separator. It mounts underneath the vehicle near the fuel tank. This filter is a factory requirement for 2019–2024 Ram 2500–5500 trucks with the 6.7L Cummins diesel engine, as well as 2020–2023 Ram 1500, Jeep Wrangler JL, and Jeep Gladiator JT models equipped with the 3.0L EcoDiesel engine.

Q: What is the micron rating and media type used in this filter?

A: This filter uses a high-efficiency synthetic fiber media engineered for multi-layer depth filtration. It boasts an ultra-fine 2-micron filtration rating, allowing it to trap exceptionally small suspended particles and strip water out of the diesel fuel before it can travel downstream to cause corrosion or high-pressure injector damage.

Q: What are the exact step-by-step instructions for replacing this filter and priming the fuel system?

A: Because this filter is chassis-mounted near the fuel tank, replacing it requires proper draining and a strict priming sequence to protect your high-pressure fuel pump from running dry:

1.Drain the water and fuel:Position a drain pan underneath.

Locate the filter housing under the rear chassis near the fuel tank. Unscrew the water-in-fuel (WIF) drain valve at the bottom of the housing to let the trapped water and diesel fuel drain completely out into a catch pan.

2.Remove the housing cap or canister:Use a filter wrench or socket.

Carefully unscrew the housing cap/canister. Keep it upright as you lower it, as it may still contain a small amount of residual fuel. Pull the old filter cartridge element straight out of the housing or cap.

3.Replace the O-ring and filter element:Do not reuse old seals.

Remove the old rubber O-ring from the housing threads. Wipe down the sealing surfaces with a clean, lint-free rag. Install the new lubricated O-ring included in your Mopar kit, then firmly press the new 68436631AA filter cartridge into place until it seats completely.

4.Reassemble and close the drain:Hand tighten to prevent cross-threading.

Thread the housing or cap back onto the vehicle chassis mount by hand first to prevent cross-threading, then tighten it to factory spec using your tool. Ensure the bottom water-in-fuel drain valve is completely closed and snug.

5.Prime the fuel system:Crucial to prevent fuel pump damage.

Do not crank the engine immediately. Turn the ignition key to the "RUN" position (or press the Start button without pushing the brake pedal) and leave it on for 15–20 seconds to allow the electric lift pump to completely fill the dry rear filter housing. Cycle the ignition off and repeat this priming process 3 to 5 times before starting the vehicle. Check the rear chassis for any leaks.

1.Drain the water and fuel:Position a drain pan underneath.

Locate the filter housing under the rear chassis near the fuel tank. Unscrew the water-in-fuel (WIF) drain valve at the bottom of the housing to let the trapped water and diesel fuel drain completely out into a catch pan.
2.Remove the housing cap or canister:Use a filter wrench or socket.

Carefully unscrew the housing cap/canister. Keep it upright as you lower it, as it may still contain a small amount of residual fuel. Pull the old filter cartridge element straight out of the housing or cap.
3.Replace the O-ring and filter element:Do not reuse old seals.

Remove the old rubber O-ring from the housing threads. Wipe down the sealing surfaces with a clean, lint-free rag. Install the new lubricated O-ring included in your Mopar kit, then firmly press the new 68436631AA filter cartridge into place until it seats completely.
4.Reassemble and close the drain:Hand tighten to prevent cross-threading.

Thread the housing or cap back onto the vehicle chassis mount by hand first to prevent cross-threading, then tighten it to factory spec using your tool. Ensure the bottom water-in-fuel drain valve is completely closed and snug.
5.Prime the fuel system:Crucial to prevent fuel pump damage.

Do not crank the engine immediately. Turn the ignition key to the "RUN" position (or press the Start button without pushing the brake pedal) and leave it on for 15–20 seconds to allow the electric lift pump to completely fill the dry rear filter housing. Cycle the ignition off and repeat this priming process 3 to 5 times before starting the vehicle. Check the rear chassis for any leaks.

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