Common Rail Cowboys
HP4 / 1KD Injector Pump Upgrade Kit
HP4 / 1KD Injector Pump Upgrade Kit
Regular price
$721.00 NZD
Regular price
Sale price
$721.00 NZD
Taxes excluded. Shipping calculated at checkout.
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HP4 / 1KD Injector Pump Upgrade Kit
✅ What’s Included
- Adapter shaft & hardware kit
- 3D-printed drilling jig for precise fitment
- Genuine high-pressure pump-to-rail fuel line
- Optional: Supply with or without HP4/1VD pump (new or BYO)
Note: Oil cooler modification required (cut & TIG weld aluminium). Fuel line must be bent to suit.
🧰 Installation Overview
- Engine-in installation possible (easier during rebuild with timing case removed)
- Jig included for accurate drilling & tapping of new pump mount holes
-
Oil cooler clearance mod required for larger pump body
- DIY: Instructions provided for self-modification
- Fuel temp sensor harness extension required (solder + heat-shrink recommended)
💡 Pump Options
- ✅ Brand-new Genuine Denso HP4/1VD pump
- ✅ Kit only — supply your own compatible pump
Note: For BYO pumps, the pump shaft is trimmed and the woodruff key removed. Full instructions included.
🔧 Tuning & Setup
- Perform SCV (Suction Control Valve) relearn with a capable scan tool after install
- Professional ECU calibration highly recommended to achieve target rail pressure and avoid over-fueling
- Verify overall fuel system health (rail sensor, relief/blank, injectors, lines) prior to tuning
⚠️ Important Notes & Compliance
- Use: Intended for off-road/competition applications where permitted. Check local regulations regarding fuel system modifications.
- Warranty/insurance: Modifications may affect manufacturer warranty or insurance. Confirm with your provider.
- Professional work advised: Pump machining, oil cooler modification and tuning should be performed by experienced technicians.
- Post-install checks: Verify commanded vs actual rail pressure, check for leaks, clear DTCs and road test under load.
📦 Shipping & Payment
- Fast Dispatch · Free Express Shipping Australia-Wide
- Buy Now, Pay Later — Afterpay, Humm, Klarna & Zip
Frequently Asked Questions
Can I install the kit with the engine still in the vehicle?
Yes — engine-in installation is possible. It’s easier during a rebuild with the timing case removed, but the included drilling jig is designed to make in-car installs accurate.
Do I have to modify the oil cooler?
Yes — the larger HP4 body requires clearance on the oil cooler (cut & weld). DIY instructions are included, or have a fabricator handle it.
Will my stock ECU tune work after the swap?
You should plan for a custom ECU calibration. At minimum, complete an SCV relearn with a scan tool; tuning is recommended to command correct rail pressure and maintain drivability.
Can I use my own HP4/1VD pump?
Yes — choose the kit-only option. Your pump will require shaft trimming and woodruff key removal per the supplied instructions.
Do I need to modify wiring?
Yes — the fuel temperature sensor harness typically needs a short extension. We recommend solder and heat-shrink for reliability.
