High-Pressure Injection Pipe 8-97148963-4 8971489634 For ISUZU NPR/NQR 4HE1 4.8L 1998-2004 — OEM Fuel Line For Cylinder #1 With 20,000+ PSI Integrity
| OEM Part Number: | 8-97148963-4 / 8971489634 | Part Name: | PIPE; INJ NO 1 / Injection Pipe No.1 |
| Engine Compatibility: | ISUZU 4HE1 4.8L Diesel | Vehicle Models: | ISUZU NPR, NQR, NPR-HD (1998–2004) |
| Material: | Hardened Seamless Alloy Steel | Operating Pressure: | 20,000+ PSI |
| Cylinder Position: | No. 1 Cylinder | Condition: | Brand New — 100% Quality Inspected |
| Warranty: | 12 Months | ||
| High Light: | Isuzu NPR high-pressure fuel pipe,OEM Isuzu 4HE1 injection line,4.8L Isuzu fuel line with warranty |
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The Injection Pipe No. 1 (PIPE; INJ NO 1) with Genuine ISUZU OEM number 8-97148963-4 (also listed as 8971489634) is a verified direct-fit replacement for the #1 cylinder high-pressure fuel line on ISUZU 4HE1 4.8L diesel engines.
- Real Shop Test Data: Precision-engineered to exact OEM length, internal diameter, and cone seat geometry
- Proven Durability: Constructed from hardened seamless alloy steel capable of withstanding sustained pressures exceeding 20,000 psi
- Installation Success Rate: 99% direct bolt-on fitment
- OEM Cross-Reference Verified: Replaces 8971489634, 8-97148963-4, 897148-9634, 8-97148-9634
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 #1 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
Primary Applications:
| 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 |
- This injection pipe is specifically for the #1 cylinder on ISUZU 4HE1 engines
- For #2, #3, and #4 cylinder pipes, refer to part numbers 8-97148964-3, 8-97148965-3, and 8-97148966-3 respectively
- Please verify your vehicle's chassis code, production year, and engine code before ordering
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify exact OEM length, internal diameter, and cone seat geometry |
| Material Composition | Hardened seamless alloy steel analysis to verify 20,000+ psi pressure integrity |
| Cone Seal Integrity | 100% inspection of precision-formed cone seals for metal-to-metal gas-tight sealing |
| Pressure Test | High-pressure testing to guarantee zero leakage under operating conditions |
| Corrosion Resistance | Material verification to ensure resistance to fuel corrosion and environmental factors |
| Final Assembly Inspection | 100% visual and dimensional inspection before packaging |
High-pressure injection pipes operate under extreme pressure. ISUZU service manuals explicitly mandate that injection pipes must be replaced with new ones whenever removed — these are single-use components.
Pre-Installation Checklist:
- Do not reuse old injection pipes — they are single-use components
- Do not bend or modify injection pipes — they are precision-shaped for correct fuel delivery timing and sealing
- Depressurize the fuel system before starting work
- Clean the area around the injector and injection pipe connections to prevent contamination
- Inspect the injector and pump connections for damage — replace if necessary
Installation Guidelines (Reference ISUZU workshop manual):
- Depressurize the common rail fuel system and disconnect the negative battery terminal
- Remove the old injection pipe from the #1 injector and injection pump
- Clean the connection surfaces thoroughly
- CRITICAL: Install the new injection pipe with correct orientation — no bending or modification allowed
- CRITICAL: Torque the pipe connections to manufacturer's specified torque settings to ensure proper cone seal metal-to-metal joint formation
- Prime the fuel system and check for leaks
- Start the engine and inspect for fuel leaks around the connections
- Packaging: Each injection pipe is securely packed in protective packaging to prevent shipping damage
- Delivery Time: 1-3 work days
- Packaging Type: Cartons
- Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners
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