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This SCV Valve Fuel Pump Suction Control Valve Overhaul Kit with OEM number 8-98043687-0 is a verified OEM-grade complete repair kit for the Denso HP3 high-pressure fuel pump used on ISUZU 4HK1, 4HJ1, and 6HK1 diesel engines. Manufactured to Denso's stringent OEM specifications (Denso model 294200-0650), this comprehensive overhaul kit includes the Suction Control Valve (SCV) and all necessary gaskets and seals required to restore proper fuel pressure regulation.
The SCV is a critical component of the common rail fuel system, responsible for precisely controlling the volume of fuel entering the high-pressure pump's plunger chamber. A failing SCV leads to unstable rail pressure, rough running, and loss of power.
✅OEM Specification — Verified by ISUZU OEM part number 8-98043687-0 and Denso model 294200-0650
✅Complete Overhaul Kit — Includes SCV valve, all necessary gaskets, and seals
✅Precision Electrical Specifications — 24V operation with coil resistance of 8.5 ohms
✅Compact & Lightweight — Net weight of approximately 244.1 g per valve
Failure Symptoms
If your SCV valve is failing, you may experience one or more of the following symptoms:
Rough Idle or Uneven Running: Engine idles roughly with noticeable vibration or diesel knock
Loss of Engine Power: Significant reduction in power and acceleration, especially under load
Hard Starting / Extended Cranking: Difficulty starting the engine, especially when cold
Engine Stalling: Intermittent or unexpected stalling, particularly at low speeds
Excessive Exhaust Smoke: Black smoke under load or white smoke indicating incorrect fuel delivery
Poor Fuel Economy: Noticeable drop in fuel efficiency
Diagnostic Trouble Codes: DTCs related to fuel rail pressure or common rail system
Fuel Leakage: Visible diesel fuel seepage from the pump area
⚠️ Important: A failing SCV valve can lead to progressive power loss, injector damage, and costly high-pressure fuel pump failure. Prompt replacement with a quality OEM overhaul kit is essential.
Vehicle & Engine Compatibility
⚠️ CRITICAL: This SCV overhaul kit is designed for ISUZU 4HK1, 4HJ1, and 6HK1 diesel engines. Verify your engine code and pump model before ordering.
Primary Applications — ISUZU Trucks:
Brand
Model
Chassis / Series
Engine
Years
ISUZU
NPR
N-Series
4HK1 5.2L
2005-2015
ISUZU
NPR-HD
N-Series
4HK1 5.2L
2005-2015
ISUZU
NQR
N-Series
4HK1 5.2L
2005-2015
ISUZU
NNR
N-Series
4HK1 5.2L
2005-2015
Primary Applications — Construction Equipment:
Brand
Equipment Type
Models
Engine
Hitachi
Crawler Excavators
ZX200-3, ZX240-3, ZX330-3, ZX350-3
4HK1, 6HK1
Kobelco
Crawler Excavators
SK200-8
4HK1
Cross-Reference Part Numbers
Brand
Part Number
Denso
294200-0650, 294200-0670
ISUZU
8-98043687-0, 8980436870, 8-98043-687-0
ISUZU (Alternate)
8-98181831-0, 8981818310, 8-98181-831-0
ISUZU (Related)
8981305080, 8-98130508-0, 8-98130-5080
Features & Benefits
Feature
Benefit
OEM Specification — Denso Genuine Equivalent
Guarantees factory-fit quality and performance
Complete Overhaul Kit
Solves common faults such as fuel leakage and low fuel pressure
Precision 24V 8.5-ohm Coil
Ensures accurate electrical response and stable fuel pressure
Japan Manufacturing
Manufactured to OEM specifications for reliable performance
Direct Replacement Fitment
No modifications required — engineered as direct match
100% New — No Core Charge
Guarantees zero wear and immediate pressure regulation
Quality Control & Verification
QC Item
Verification Method
Dimensional Accuracy
Precision inspection to verify mounting dimensions match OE specifications
Coil Resistance Test
100% bench testing to verify 8.5-ohm coil resistance
Flow Rate Test
Dynamic flow testing to verify fuel volume control
Leakage Test
100% high-pressure leak test to guarantee zero fuel leakage
Solenoid Function Test
Full electrical actuation testing to verify precise valve operation
Installation & Maintenance
⚠️ IMPORTANT: Professional Installation Highly Recommended. SCV valve and fuel pump overhaul 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
Use clean, high-quality fuel and replace the fuel filter simultaneously
Clean the area around the SCV valve and high-pressure pump
Quantity Required: 1 kit per high-pressure pump
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
Packaging & Supply
Packaging: Neutral box, color box, or customer brand package Pack Quantity: 1 kit Net Weight (Valve): Approx. 244.1 g Gross Weight (Kit): Approx. 1.2 kg (with package) Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners
Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...