Description
Injection pump 2.0 HDi 100 kW RHR with DELPHI 5WS40019 system for CITROËN, PEUGEOT, FORD, VOLVO, MAZDA vehicles. Without fuel pressure regulator. Tested, with warranty of functionality.
This high-pressure injection pump is designed for the PSA 2.0 HDi RHR engine (100 kW) and is often searched for by its OEM numbers 9656391680, 9424A000A or Delphi reference 5WS40019. It delivers precise fuel metering and timing required by common-rail diesel systems, ensuring reliable engine performance and smooth acceleration. The unit is supplied without an integrated fuel pressure regulator and is suited for professional garages and experienced DIY mechanics who service Citroën and Peugeot vehicles or compatible partner-brand models.
Technical Information
- Manufacturer: Delphi
- Model: 2.0 HDi RHR (100 kW)
- Product Codes: 9656391680, 9424A000A, 1920LP
- Additional Numbers: 5WS40019, 1921N3
Compatibility Examples
Commonly fitted To: Citroën C5, Citroën C5 X7, Peugeot 407. Also used on various vehicles from Ford, Volvo and Mazda that are equipped with the PSA 2.0 HDi RHR engine. Always match the pump part numbers when searching for replacements, as many customers find this product by OEM code.
Function And Role
The injection pump supplies high-pressure fuel to the engine injectors according to the engine’s control signals. It controls fuel quantity and timing for each injection event, directly affecting emissions, fuel economy and drivability. This pump does not include an internal fuel pressure regulator, so the vehicle’s fuel-pressure control is handled by the engine management system or separate components.
Installation Recommendations
- Disconnect The Battery Before Starting And Relieve Fuel System Pressure.
- Use Clean Work Area And New Seals/O-Rings To Avoid Contamination—Fuel System cleanliness Is Critical.
- Mark Timing Positions And Follow The Engine Manufacturer’s Timing Procedure Precisely; Incorrect Timing Can Cause Severe Engine Damage.
- Replace Any Fuel Lines, Banjo Bolts And Copper Washers That Show Wear Or Deformation.
- After Installation, Prime The Fuel System Carefully, Bleed Air From Lines, Then Start Engine And Check For Leaks And Proper Fuel Pressure.
- If Access Is Available, Consider Inspecting/Servicing The Timing Belt Or Drive Components During Pump Replacement.
- Use A Diagnostic Tool To Clear Fault Codes And Verify Pump Actuator Signals Where Applicable.
Most Common Failure Reasons
- Contaminated Fuel Or Blocked Fuel Filter Leading To Abrasive Wear Of Internal Components.
- Electrical Or Actuator Faults Causing Incorrect Fuel Delivery.
- Wear Of Internal Plungers, Racks Or Bearings After High Mileage—Typical Lifespan Varies With Maintenance; Failures May Occur From ~100,000 Km To Higher, Depending On Service History.
- Water In Fuel Causing Corrosion And Reduced Lubrication.
- Improper Installation Or Timing Mistakes Leading To Mechanical Damage.
This pump is a direct replacement for vehicles fitted with the 2.0 HDi RHR engine using the Delphi 5WS40019 system. When ordering, compare the listed product codes with the part you are replacing to ensure correct fitment. Ideal For Professional Workshops And Skilled DIY Enthusiasts Looking For A Reliable High-Pressure Fuel Pump Replacement.
