Direction Plus
BT50 Pre-Filter - 4JJ3 - With In Cab Alarm - 2020 On
BT50 Pre-Filter - 4JJ3 - With In Cab Alarm - 2020 On
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Mazda BT-50 4JJ3-TCX 3.0L | In-Cab Water Alarm | 2020 to 2026
One tank of bad diesel can destroy your injectors. The PreLine-Plus sits ahead of the factory filter and stops water and particles before they get there, then warns you in the cab when it has caught water.
The PL645DPK is a vehicle-specific kit for the 4JJ3-TCX BT-50, with in-cab alarm wiring and mounting hardware included. Built for towing, touring and remote refuelling.
What Is Included
- PreLine-Plus filter assembly (PL150DP element)
- Vehicle-specific mounting bracket and hardware
- Fuel line and fitting kit
- Water alarm kit with in-cab module (visual 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 guesswork.
- Spin-on element for fast servicing with no mess
- Helps prevent corrosion, rust and fuel-system wear
Vehicle Fitment
- Mazda BT-50 4JJ3-TCX 3.0L 4cyl, 2020 to 2026
The same PL645DPK kit is also listed by Direction Plus for the 4JJ3-TCX Isuzu D-Max and MU-X, 2020 to 2026.
Note: this is for the 4JJ3-TCX BT-50 from 2020 only. Earlier BT-50 models run a different engine and take a different kit.
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 wiring, then priming and a leak check.
- Installation by a competent qualified mechanic is recommended.
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 a pre-2020 BT-50?
A: No. The PL645DPK is listed for the 4JJ3-TCX BT-50 from 2020 only.
Q: Is it the same kit as the D-Max and MU-X?
A: Yes. Direction Plus lists the PL645DPK for the 4JJ3-TCX D-Max, MU-X and BT-50.
Q: How do I know when water is detected?
A: The in-cab alarm gives a visual 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 or rego and we will confirm before you order.
The Protection It Should Have Had From Factory
Direction Plus PreLine-Plus PL645DPK for the 4JJ3-TCX BT-50. In-cab water alert included. Free express shipping Australia-wide.
Common Rail Cowboys is not affiliated with Mazda, Isuzu 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 and particle separation figures are manufacturer specifications. Aftermarket modifications may affect vehicle warranty and compliance.
