Denso HP5 22100-0E020 Fuel Pump: Specifications, Performance, Applications & HP5 vs HP4 Comparison

Modern Toyota diesel engines demand higher fuel pressure, better atomization, and stricter emissions control than previous generations. To meet these requirements, Denso developed the HP5 common rail fuel pump, a new-generation high-pressure pump used on Toyota's GD-series diesel engines.

Among the most common variants is Denso HP5 22100-0E020, which powers vehicles equipped with the 1GD-FTV 2.8L and 2GD-FTV 2.4L engines.

This guide focuses on its technical specifications, design features, vehicle applications, and the differences between HP5 and HP4, while also covering common maintenance considerations and replacement tips.

Table of Contents

  1. What Is the Denso HP5 22100-0E020?
  2. Technical Specifications
  3. HP5 Design & Performance Features
  4. Vehicle & Engine Applications
  5. HP5 vs HP4 Fuel Pump
  6. Common Problems and Maintenance Tips
  7. Replacement Considerations
  8. Aftermarket Replacement Parts
  9. Frequently Asked Questions
  10. Conclusion
Denso HP5 22100-0E020 Fuel Injection Pump

1. What Is the Denso HP5 22100-0E020?

The 22100-0E020 is a Toyota OE high-pressure fuel pump manufactured by Denso for modern common rail diesel systems.

Compared with previous HP-series pumps, HP5 was engineered to deliver:

  • Higher injection pressure
  • Faster electronic control
  • Improved fuel metering accuracy
  • Better combustion efficiency
  • Compliance with modern emission standards

Instead of simply increasing pumping capacity, HP5 focuses on precise pressure regulation, allowing the ECU to maintain stable rail pressure under varying engine loads.

This makes it particularly suitable for Toyota's latest diesel passenger vehicles and light commercial models.

2. Technical Specifications

  • Pump Family: HP5
  • Fuel System: Common Rail Diesel
  • OEM Number: 22100-0E020
  • Denso References: 299000-0050 / 299000-0051
  • Engine Compatibility: 1GD-FTV / 2GD-FTV
  • Pump Type: HP5S / HP5D
  • Maximum Pressure Capability: Up to approximately 2,500 bar (250 MPa)
  • Control System: Pre-Stroke Control Valve
  • Lubrication: Diesel Fuel
  • Housing Material: Aluminum Alloy

Note: Actual rail pressure depends on ECU calibration and vehicle configuration.

3. HP5 Design & Performance Features

3.1 Higher Fuel Pressure

One of HP5's biggest improvements is its ability to support significantly higher fuel pressure than earlier generations.

Higher injection pressure offers several benefits:

  • finer fuel atomization
  • cleaner combustion
  • lower particulate emissions
  • improved power output
  • enhanced fuel economy

This is especially important for Euro 6 diesel engines.

3.2 Pre-Stroke Control Technology

Unlike older pumps that regulate fuel entering the pumping chamber, HP5 controls how much fuel is discharged during each pumping cycle.

Advantages include:

  • faster pressure response
  • smoother engine operation
  • improved idle stability
  • more accurate rail pressure regulation
  • better transient acceleration

3.3 Lightweight Construction

HP5 incorporates aluminum structural components where high strength steel is unnecessary.

Benefits include:

  • reduced overall weight
  • improved heat dissipation
  • lower engine load
  • improved packaging

3.4 Designed for Advanced Common Rail Systems

HP5 supports newer electronically controlled injection systems, making it compatible with advanced injector technologies and modern ECU strategies used in Toyota GD engines.

4. Vehicle & Engine Applications

The HP5 22100-0E020 is primarily used on Toyota's GD diesel engine family.

4.1 Typical Vehicle Applications

  • Toyota Hilux — 1GD-FTV (2.8L), 2015–Present
  • Toyota Hilux — 2GD-FTV (2.4L), 2015–Present
  • Toyota Fortuner — 1GD-FTV / 2GD-FTV, 2015–Present
  • Toyota Hiace H300 — 1GD-FTV (2.8L), 2019–Present
  • Toyota Land Cruiser Prado — 1GD-FTV / 2GD-FTV, Post-2015 (varies by market)
  • Toyota Land Cruiser 70 Series — 1GD-FTV (2.8L), 2023–Present (selected markets)

4.2 Engine Overview

1GD-FTV

  • Engine Type: 2.8L Turbo Diesel
  • Configuration: Inline 4-cylinder
  • Valve Train: DOHC 16-Valve
  • Power Output: Approximately 174–197 HP

2GD-FTV

  • Engine Type: 2.4L Turbo Diesel
  • Configuration: Inline 4-cylinder
  • Valve Train: DOHC 16-Valve
  • Power Output: Approximately 150–170 HP

5. HP5 vs HP4 Fuel Pump

Although both belong to Denso's HP family, they target different engine platforms.

HP5

  • Latest-generation design
  • Maximum pressure up to approximately 2,500 bar
  • Uses a Pre-Stroke Control Valve
  • Mainly for passenger cars and light commercial vehicles
  • Suitable for 2.4L–2.8L diesel engines
  • Designed for Euro 6-oriented systems

HP4

  • Previous-generation design
  • Maximum pressure up to approximately 1,800 bar
  • Uses a Suction Control Valve (SCV)
  • Mainly for medium-duty commercial vehicles
  • Suitable for 4.5L–7.8L diesel engines
  • Common in Euro 4/5 applications

5.1 Pressure Capability

HP5 supports considerably higher fuel pressure, allowing modern injectors to produce finer fuel spray.

The result is:

  • lower emissions
  • quieter combustion
  • higher efficiency

5.2 Fuel Metering Strategy

HP4 regulates incoming fuel volume using an SCV.

HP5 adjusts the effective pumping stroke, enabling more responsive pressure control during acceleration and load changes.

5.3 Intended Applications

Choose HP5 for:

  • Toyota Hilux
  • Toyota Fortuner
  • Toyota Hiace
  • Toyota Prado
  • 1GD-FTV engines
  • 2GD-FTV engines

Choose HP4 for:

  • Isuzu trucks
  • Hino trucks
  • Large-displacement diesel engines

HP4 and HP5 are not interchangeable.

6. Common Problems and Maintenance Tips

HP5 is highly reliable, but like all common rail pumps, it depends heavily on fuel quality.

Typical issues include:

  • contaminated diesel fuel
  • internal plunger wear
  • control valve malfunction
  • low rail pressure
  • hard starting
  • power loss
  • fuel pressure fault codes

Recommended maintenance:

  • replace fuel filters regularly
  • use clean diesel fuel
  • avoid water contamination
  • maintain adequate fuel level
  • inspect injectors when pump wear is suspected
HP5 common rail fuel pump

7. Replacement Considerations

Before installing a replacement HP5 pump, verify:

  • Toyota OE number
  • Denso reference number
  • engine code
  • VIN
  • electrical connector
  • pipe routing
  • mounting configuration

Also inspect:

  • injectors
  • fuel rail
  • high-pressure pipes
  • fuel tank
  • return lines

Remaining metal particles can quickly damage a replacement pump.

8. Aftermarket Replacement Parts

Common replacement options include:

  • Complete HP5 pump assemblies
  • Plunger & barrel kits
  • Pre-Stroke Control Valves
  • Seal kits
  • Fuel temperature sensors

Always verify both Toyota and Denso part numbers before ordering.

Related Models in This Series:

  • 299000-0060
  • 299000-0080
  • 22100-0E010
  • 22100-0E030

Read more: Denso HP5 22100-0E020 Fuel Pump for Toyota 1GD-FTV / 2GD-FTV: Specs & Repair Guide

9. Frequently Asked Questions

Q1. What engines use Denso HP5 22100-0E020?

It is commonly installed on Toyota 1GD-FTV and 2GD-FTV diesel engines used in the Hilux, Fortuner, Hiace, Prado, and some Land Cruiser 70 models.

Q2. What is the maximum pressure of HP5?

The HP5 platform supports common rail systems up to approximately 2,500 bar (250 MPa), depending on engine calibration.

Q3. What is the difference between HP5 and HP4?

HP5 uses a Pre-Stroke Control Valve, supports higher injection pressure, and is intended for modern passenger and light commercial diesel vehicles. HP4 uses an SCV and is mainly designed for medium-duty diesel engines.

Q4. Are 22100-0E020 and 299000-0050 the same?

22100-0E020 is Toyota's OE number, while 299000-0050 and 299000-0051 are Denso reference numbers for related HP5 pump variants. Always confirm compatibility before purchasing.

Q5. Can an HP4 replace an HP5?

No. The two pumps differ in pressure capability, control system, mounting design, and ECU calibration, so they are not interchangeable.

Q6. What should be checked before replacing an HP5 pump?

Inspect the fuel quality, injectors, fuel filter, fuel rail, and high-pressure lines to ensure no contamination remains in the system.

10. Conclusion

The Denso HP5 22100-0E020 represents a significant advancement in common rail fuel pump technology for Toyota GD-series diesel engines. Its higher pressure capability, improved fuel metering strategy, and compatibility with advanced engine management systems make it well suited for modern diesel vehicles.

Understanding the differences between HP5 and HP4, confirming the correct OE and Denso part numbers, and following proper maintenance procedures are essential for achieving reliable performance and long service life. For workshops and distributors, selecting the correct replacement components based on engine model and pump identification helps ensure accurate fitment and dependable operation.

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