Description
Injection pump 2.0 HDi 100 kW RHR RHK with SIEMENS VDO 5WS40019 system for CITROËN, PEUGEOT, FORD, VOLVO, MAZDA vehicles. With fuel pressure regulator. Tested, with warranty of functionality.
This high-pressure injection pump is designed for 2.0 HDi engines delivering 100 kW and fits a range of PSA and related engines (RHR / RHK). Ideal for professional workshops and experienced DIY mechanics, the pump restores precise fuel metering and pressure control for reliable combustion, better drivability and reduced smoke. Typical search terms: injection pump 2.0 HDi, Siemens VDO 5WS40019, 1920QH, 1920N8, 9658193980, 9688153080.
Applications And Compatibility
Fits vehicles and models commonly equipped with the 2.0 HDi RHR / RHK engines, including but not limited to Citroën and Peugeot passenger cars as well as some Ford, Volvo and Mazda models that share PSA diesel units. Common vehicle models where this pump is used: Citroën C4, Citroën C4 Picasso, Citroën C5 (including X7), Citroën C8; Peugeot 307, Peugeot 407, Peugeot 607, Peugeot 807.
Technical Information
- Manufacturer: Siemens VDO
- Model: 2.0 HDi 100 kW (RHR / RHK)
- Product Codes: 5WS40019, 5WS40809
- Other Numbers: 9658193980, 9688153080, 1920QH, 1920N8
What This Part Does
The high-pressure injection pump supplies the common-rail (or pump-controlled) fuel system with metered diesel at the correct pressure and timing. It integrates a pressure regulator/actuator to keep rail pressure within target values and ensures each injector receives the precise volume of fuel for efficient combustion.
Common Symptoms Of A Faulty Pump
- Loss of power and poor acceleration
- Hard starting or extended cranking
- Increased smoke (black or white) and rough idle
- Fuel leaks at pump flanges or lines
- Fault codes related to fuel pressure, fuel delivery or injector timing
Recommended Installation
Replacement of a high-pressure injection pump requires careful mechanical and diagnostic work. Follow these general recommendations:
- Work In A Clean Environment: Prevent contamination of fuel lines and pump internals—dirt and water cause premature failure.
- Observe Timing Marks: Align pump and engine timing marks exactly. Incorrect timing can cause poor performance or engine damage.
- Use Manufacturer Torque Specs: Tighten mounting bolts and fuel line connections to the vehicle manufacturer’s specifications.
- Replace Seals And Crush Washers: Always fit new gaskets, O-rings and washers for fuel lines to prevent leaks.
- Prime And Bleed The Fuel System: Remove air from the system before starting the engine to avoid cavitation and damage.
- Calibration And Coding: Many modern injection pumps require calibration or coding to the engine control unit after fitment—use a diagnostic tool or have the vehicle programmed by a qualified workshop if needed.
Why This Part Most Often Fails
Failure of injection pumps is usually the result of fuel contamination (dirt, water, or poor-quality diesel), neglected fuel filters, prolonged operation with low fuel levels (leading to cavitation), or wear of internal mechanical components over high mileage. Electrical faults in the pressure regulator/actuator or poor lubrication caused by contaminated fuel also accelerate wear. Regular fuel filter changes and clean refuelling are the most effective preventive measures.
If you are servicing or replacing the pump yourself, ensure you have appropriate tools, a clean workspace and a plan for calibration/coding where required. For workshop professionals, this unit offers a direct-fit replacement option for affected 2.0 HDi installations and helps restore correct fuel pressure control and engine performance.
