Direction Plus
D-Max Pre-Filter - 4JJ3 - With In Cab Alarm - 2020 On
D-Max Pre-Filter - 4JJ3 - With In Cab Alarm - 2020 On
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Isuzu 4JJ3-TCX 3.0L | D-Max, MU-X, BT-50 | 2020 to 2026
One tank of wet diesel can take out a set of injectors. The PreLine-Plus sits ahead of the factory filter and strips water and particles out first, then warns you in the cab when it has caught water.
The PL645DPK suits the 4JJ3-TCX D-Max. The same kit is listed by Direction Plus for the MU-X and Mazda BT-50 on the same engine.
What Is Included
- PreLine-Plus filter assembly (PL150DP element)
- Vehicle-specific mounting bracket
- Fuel line and fitting kit
- Mounting hardware (bolts, washers, nuts)
- Water alarm kit with in-cab module (LED and audible)
- Cable ties and installation instructions
Kit contents are set by Direction Plus and may change with component availability.
Key Features
- 100% water separation efficiency (Direction Plus figure, based on 150 to 300 micron droplet size)
- 98% particle separation (based on 30 micron particles)
- Remote multi-stage in-cab water alert, visual and audible. No manual water checks.
- Spin-on element for quick, clean servicing, flow up to 150 L/h
- Protects against corrosion and abrasive wear in the fuel system
Vehicle Fitment
- Isuzu D-Max 4JJ3-TCX 3.0L 4cyl, 2020 to 2026
- Isuzu MU-X 4JJ3-TCX 3.0L 4cyl, 2020 to 2026
- Mazda BT-50 4JJ3-TCX 3.0L 4cyl, 2020 to 2026
Note: earlier 4JJ1 D-Max and MU-X take a different kit. Direction Plus's description starts the MU-X at 2021; its fitment table starts it at 2020.
Fitment per Direction Plus as of October 2026. Check the fitment guide or send us your VIN if unsure.
Fitting Notes
- Fuel path: tank, PreLine, factory filter.
- Install covers the bracket, PreLine assembly, fuel line routing, water alarm, then priming and a leak check.
- Installation by a competent qualified mechanic is recommended. Allow 2 to 2.5 hours for a DIY install.
Servicing
- Replace the element every 40,000 km or per your vehicle service schedule. Replacement: PL150DP.
- When the in-cab alarm activates, open the drain tap and release the water.
Related Kits
Shipping and Payment
- Free express shipping Australia-wide.
- Afterpay, Humm, Klarna and Zip available at checkout.
- Returns and warranty are handled under our refund policy.
Frequently Asked Questions
Q: Does this fit the older 4JJ1 D-Max?
A: No. The PL645DPK is listed for the 4JJ3-TCX from 2020. Earlier 4JJ1 vehicles take a different kit.
Q: Is it the same kit for the D-Max, MU-X and BT-50?
A: Yes. Direction Plus lists the PL645DPK for all three on the 4JJ3-TCX.
Q: How do I know when water is detected?
A: The in-cab alarm gives a visual (LED) and audible warning. Drain it through the tap at the base of the filter.
Q: How do I confirm it fits my vehicle?
A: Check the Direction Plus fitment guide or send us your VIN and we will confirm before you order.
Keep Water Out of the 4JJ3
Direction Plus PreLine-Plus PL645DPK for the 4JJ3-TCX D-Max. In-cab water alert included. Free express shipping Australia-wide.
Common Rail Cowboys is not affiliated with Isuzu, Mazda or Direction Plus. Direction Plus and PreLine-Plus are trademarks of their respective owners. Installation by a competent person is recommended. Fitment is the buyer's responsibility: confirm against the Direction Plus fitment guide or send us your VIN before ordering. Water separation, particle separation and flow figures are manufacturer specifications. Aftermarket modifications may affect vehicle warranty and compliance.
