Denso HP4 Pump Supply Pump

1.Product Introduction

The Denso HP4 pump supply pump is an integral part of the high-pressure fuel system in modern diesel engines, specifically used in the HP4 series of fuel pumps by Denso. The supply pump is responsible for delivering fuel from the low-pressure side of the fuel system to the high-pressure fuel pump, ensuring a continuous flow of fuel is available for pressurization and injection into the engine.

Main Functions of the Supply Pump:

1. Fuel Transfer: The primary role of the supply pump is to transfer fuel from the fuel tank (or the low-pressure fuel system) to the high-pressure fuel pump. It helps maintain a steady supply of fuel, which is essential for the high-pressure pump to create the necessary pressure for fuel injection.

2. Fuel Filtration: As fuel is transferred to the high-pressure pump, it often passes through filters to ensure that impurities, debris, or contaminants don’t damage the precision components of the high-pressure system. The supply pump helps push this fuel through these filtration systems, ensuring clean fuel is delivered.

3. Pressure Maintenance: While the supply pump doesn’t generate the high pressures of the main pump, it ensures that fuel is available at a sufficient flow rate and pressure to allow the high-pressure pump to function optimally. Without a consistent fuel supply, the high-pressure fuel pump would struggle to create the required pressure for efficient combustion.

4. Fuel Regulation: The supply pump works in coordination with other components, such as pressure regulators, to maintain the correct fuel pressure. This is crucial for optimizing engine performance and ensuring that fuel is delivered at the right time and in the right amount to the injectors.

Role in the HP4 System:

In the context of the Denso HP4 system, the supply pump is part of the broader system that includes components like the high-pressure pump, delivery valves, injectors, and fuel rail. Together, they ensure that fuel is delivered to the engine with precise timing and pressure, which is necessary for proper combustion, fuel efficiency, and reduced emissions.

Without a functional supply pump, the high-pressure pump would not receive the fuel it needs to pressurize and inject it into the engine, leading to poor engine performance or failure to start.

2.Product Model List

No.	Model
1	294180-0010
2	294180-0080