OEM Common Rail Fuel Pressure Limiter 8-98138695-0 8981386950 095420-0560 For ISUZU NPR75 NQR90 NMR85 FSR90 FVR34 4HK1 6HK1 4JJ1 — Denso Pressure Relief Valve
| OEM Part Numbers: | 8-98138695-0 / 8981386950 / 8-98138-695-0 | Part Name: | LIMITER; FUEL PRESS / Fuel Pressure Limiter / Pressure Relief Valve |
| Type: | Common Rail Pressure Limiting Valve (Mechanical) | Function: | Opens At Set Pressure To Relieve Excess Fuel To Return Line |
| Net Weight: | Approx. 125.5 G | Material: | Heavy-Duty Zinc-Plated Steel |
| Certification: | CE, IATF 16949 | Engine Compatibility: | ISUZU 4HK1, 6HK1, 4JJ1 |
| Vehicle Compatibility: | ISUZU NPR75, NQR90, NMR85, FSR90, FVR34, NPR6SN | Emission Standards: | Euro 5 |
| Production Years: | 2009 Onwards | Condition: | Brand New — 100% Quality Inspected |
| Warranty: | 12 Months / 20,000 Km | ||
| High Light: | OEM Common Rail fuel pressure limiter for ISUZU,Denso pressure relief valve for 4HK1 engine,ISUZU NPR75 fuel pressure limiter with warranty |
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The Common Rail Fuel Pressure Limiter (Pressure Relief Valve) with OEM numbers 8-98138695-0 (also listed as 8981386950, 8-98138-695-0) is a verified OEM-grade direct replacement for a wide range of ISUZU diesel engines, including the 4HK1, 6HK1, and 4JJ1.
Manufactured to Denso OEM specifications (Denso model 095420-0560), this mechanical pressure relief valve is a critical safety component of the common rail fuel system. It is mounted directly on the fuel rail and acts as a mechanical safety valve, opening when system pressure exceeds a predetermined threshold to release excess fuel back to the return line, thereby protecting the injectors, high-pressure pump, and fuel rail from over-pressure damage.
| Part Number | 8-98138695-0 8981386950 095420-0560 |
|---|---|
| Product Name | Common Rail Fuel Pressure Limiter |
| Car Model | ISUZU NPR75 NQR90 NMR85 FSR90 FVR34 |
| Engine Model | ISUZU 4HK1 6HK1 4JJ1 |
| Condition | 100% Brand New |
If your fuel pressure limiter is failing, you may experience one or more of the following symptoms:
- Hard Starting / No-Start: The pressure limiter leaks internally and prevents the rail from building sufficient pressure for injection.
- Engine Stalling or Hesitation Under Load: Irregular fuel pressure regulation causes the engine to stall or hesitate during acceleration.
- Excessive Exhaust Smoke: Black smoke (over-fueling) or white smoke (under-fueling) due to incorrect rail pressure.
- Reduced Power or Fuel Efficiency: The ECU cannot maintain optimal rail pressure, reducing combustion efficiency.
- Fuel Leakage or Pressure Fluctuations: Visible fuel seepage from the limiter body or erratic rail pressure readings.
- Diagnostic Trouble Codes (DTCs): Codes such as P0087 (Rail Pressure Too Low), P0088 (Rail Pressure Too High).
| Brand | Model | Chassis / Series | Engine | Emission | Years |
|---|---|---|---|---|---|
| ISUZU | NPR75 | N-Series | 4HK1 5.2L | Euro 5 | 2009 onwards |
| ISUZU | NPR6SN | N-Series | 4HK1 5.2L | Euro 5 | 2009 onwards |
| ISUZU | NQR90 | N-Series | 4HK1 5.2L | Euro 5 | 2009 onwards |
| ISUZU | NMR85 | N-Series | 4JJ1 3.0L | Euro 5 | 2010 onwards |
| Brand | Part Number |
|---|---|
| Denso | 095420-0560, 095420-0560, 0-95420056-0, 09542-00560 |
| ISUZU | 8-98138695-0, 8981386950, 8-98138-695-0, 8982492330, 8981787060 |
| Aftermarket | IRL1007 (Euro4x4parts) |
| Feature | Benefit + Verification Signal |
|---|---|
| OEM Specification — Denso Genuine Equivalent | Guarantees factory-fit quality and performance — verified by ISUZU OEM part number 8-98138695-0 and Denso model 095420-0560. |
| Precision Pressure Relief Design | Opens at factory-set pressure threshold to release excess fuel, protecting fuel system components from over-pressure damage. |
| Heavy-Duty Zinc-Plated Steel Construction | Withstands extreme fuel pressures and continuous thermal cycling without degradation. |
| 125.5 g Lightweight Design | Compact and lightweight for easy installation without adding unnecessary weight. |
| Integrated Spring Mechanism | Provides consistent, reliable pressure regulation across full operating range. |
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify all mounting dimensions match OE blueprint specifications. |
| Cracking Pressure Test | 100% bench testing to verify valve opens at specified pressure threshold. |
| Leakage Test | 100% high-pressure leak test to guarantee zero internal/external fuel leakage. |
| Flow Rate Test | Dynamic flow testing to verify relief flow volume meets OEM specifications. |
| Material Composition | Heavy-duty zinc-plated steel analysis to verify structural integrity. |
Pressure limiter replacement requires depressurization of the fuel system, extreme cleanliness, and expert knowledge of common rail systems.
Pre-Installation Checklist:
- Depressurize the fuel system before starting work
- Disconnect the negative battery terminal
- Clean the area around the pressure limiter and fuel rail to prevent contamination
- Use clean, high-quality fuel and replace the fuel filter simultaneously
Maintenance Schedule:
- Inspection: Every 50,000 km / 12 months
- Fuel Filter Replacement: Every 20,000-30,000 km
- Replacement: Recommended at 150,000-200,000 km or immediately if failure symptoms appear
- Packaging: Neutral box, color box, or customer brand package
- Pack Quantity: 1 PC
- Net Weight: Approx. 125.5 g
- Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners
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