High-Pressure Injection Pipe 8-97148966-3 8971489663 For ISUZU NPR/NQR/NPR-HD 4HE1 4.8L 1998-2004 — OEM Fuel Line For Cylinder #4
| Features: | Protective Blue Caps On Connection Points | OEM Part Number: | 8-97148966-3 / 8971489663 |
| Part Name: | PIPE; INJ NO 4 / Injection Pipe No.4 | Engine Compatibility: | ISUZU 4HE1 4.8L Diesel |
| Vehicle Models: | ISUZU NPR, NQR, NPR-HD (1998–2004) | Material: | High-Speed Steel With Machined Exterior Finish |
| Net Weight: | Approx. 3.0 Kg | Cylinder Position: | No. 4 Cylinder |
| Condition: | Brand New — 100% Quality Inspected | Warranty: | 12 Months |
| High Light: | Isuzu NPR fuel injection pipe,OEM high-pressure fuel line,4HE1 engine injection pipe |
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The Injection Pipe No. 4 (PIPE; INJ NO 4) with OEM numbers 8-97148966-3 (also listed as 8971489663) is a verified direct-fit replacement for the #4 cylinder high-pressure fuel line on ISUZU 4HE1 4.8L diesel engines. This precision-engineered component delivers precisely metered, high-pressure diesel fuel from the injection pump to the #4 injector.
If your injection pipe is failing, you may experience one or more of the following symptoms:
- Diesel Fuel Leaks: Visible fuel seepage or wetness near the #4 injector or along the pipe
- Hard Starting: Extended cranking time before the engine starts
- Engine Misfire: Rough running or misfiring, especially under load
- Loss of Engine Power: Significant reduction in acceleration and overall performance
- Strong Diesel Fuel Odor: Noticeable fuel smell in the engine bay or cabin
- Visible Damage: Cracks, corrosion, or deformation on the fuel line
| Brand | Model | Chassis / Series | Engine | Years |
|---|---|---|---|---|
| ISUZU | NPR | N-Series | 4HE1 4.8L | 1998-2004 |
| ISUZU | NQR | N-Series | 4HE1 4.8L | 1998-2004 |
| ISUZU | NPR-HD | N-Series | 4HE1 4.8L | 1998-2004 |
| Feature | Benefit |
|---|---|
| OEM Specification | Guarantees factory-fit quality and performance |
| High-Speed Steel Construction | Withstands extreme pressures and temperatures |
| Precision-Formed Tubing | Ensures proper fuel delivery routing and alignment |
| Machined Exterior Finish | Provides precise fit and reliable performance |
| Protective Blue Caps | Prevents contamination during storage and installation |
| Direct OEM Replacement | No modifications required |
| 100% New — No Core Charge | Guarantees zero wear and full service life |
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify exact OEM specifications |
| Material Composition | High-speed steel analysis for pressure integrity |
| Cone Seal Integrity | 100% inspection of precision-formed cone seals |
| Pressure Test | High-pressure testing for zero leakage |
| Corrosion Resistance | Material verification for fuel and environmental resistance |
| Final Assembly Inspection | 100% visual and dimensional inspection |
Pre-Installation Checklist:
- Do not reuse old injection pipes — they are single-use components
- Do not bend or modify injection pipes
- Depressurize the fuel system before starting work
- Clean the area around the injector and injection pipe connections
Installation Steps:
- Depressurize the fuel system and disconnect the negative battery terminal
- Remove the old injection pipe from the #4 injector and injection pump
- Clean the connection surfaces thoroughly
- Install the new injection pipe with correct orientation — no bending or modification allowed
- Torque the pipe connections to manufacturer's specified torque settings
- Proper fuel system bleeding is necessary to remove air
- Start the engine and inspect for fuel leaks around the connections
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