Common Rail Pump

To deliver fuel to the engine under the correct pressure, the common rail pump needs to be efficient and reliable.

Common Rail Pump

How DENSO common rail pumps work

The purpose of the common rail system is to increase the efficiency of diesel engine performance. During operation, an amount of fuel is delivered from the fuel pump into the common rail, which is a kind of accumulator, where it is then sent to the injectors. These electronically controlled injectors control the amount of fuel and timing when this fuel is injected under a certain pressure.

The engine ECU can control injection quantity and timing to a high level of precision, independent of engine speed or load. Even multi-injection (multiple fuel injections in one injection stroke) is possible. This ensures stable injection pressure at all times, even in the low engine speed range, and dramatically decreases the amount of black smoke emitted during start-up and acceleration.

Once the fuel is delivered from the tank to the engine, the common rail pump creates the high pressure ready for it to be put into the combustion chambers via the injectors. This makes the common rail pump a key part of the common rail system.

DENSO Common Rail Pump general image model number DCRP301260

Features and benefits

  • Ensures the reliable delivery of pressurised fuel.
  • Optimises the performance of diesel engines.
  • Range of units and parts available.
  • Suitable for a huge range of applications.
Optimises performance
The common rail pump helps to optimise diesel engine performance, lower emissions and improve fuel consumption as a key part of the common rail system.
Improves efficiency
By having the ability to create the right pressure at the right time, the common rail pump will supply fuel at the right pressure ready to be injected into the combustion chambers. In doing do, it improves the efficiency of the common rail system.
Suits range of applications
Manufactured in partnership with worldwide car makers, the common rail pump is suitable for a range of applications and is unique within the aftermarket.

Types and characteristics

DENSO’s pioneering common rail system is made to OE quality standards, ensuring optimum diesel engine performance journey after journey.

Common Rail Pump types

HP2

In 1999, this first-generation common rail pump for passenger cars was introduced. Using a double pumping mechanism to ensure smooth operation, it can create a maximum system pressure of 145 Mpa.

Because of the double pumping mechanism, this pump has two SCVs to regulate the pressure. These can be identified by the red and green connector of the valve.

HP2 type pump
HP3

In 2001, this second-generation common rail pump was introduced. It is a lighter, more compact, two-cylinder pump.

This common rail pump is used in passenger cars and compact trucks. It was originally able to create a maximum system pressure of 180Mpa, but recent developments have increased this to 200Mpa.

Because of its wide range of uses, this is the most popular common rail pump within the range.

HP3 type pump
HP4

In 2004, this common rail pump was introduced to cover the medium-sized truck range.

The working principles of this pump are exactly the same as the HP3, but this pump has three cylinders and thus a higher fuel delivery capacity. It can create a maximum system pressure of 200Mpa.

HP4 type pump

Characteristics

The common rail pump is one of the key elements of DENSO’s market-leading common rail systems.

Catalogues and leaflets

To find out more about how DENSO’s common rail system operates, take a look at our catalogues and leaflets.