Overview

This fuel rail is a direct-fit replacement for older 2.0 HDi engines equipped with Siemens injection systems. It is designed to restore reliable high-pressure fuel distribution to all injectors and to maintain correct sealing under operating pressure. Technically focused and aimed at professional mechanics and experienced DIY enthusiasts, the description below highlights compatibility, technical details and practical installation guidance. Many customers search using part numbers, so key references are included: 9640387980, 5WS40002, 1570C0.

Key Benefits

• Restores correct fuel pressure distribution to Siemens-style injectors.
• Fully sealing construction to prevent fuel leaks and pressure loss.
• OEM-compatible dimensions and mounting for straightforward replacement on applicable Citroën and Peugeot models.
• Includes common manufacturer product codes for quick identification.

Technical Information

• Manufacturer: Stellantis
• Model: 2.0 HDi (older concept) – Fits Citroën and Peugeot models with Siemens injection systems (e.g. Citroën Berlingo, Citroën Xsara, Peugeot 307, Peugeot Partner)
• Product Codes: 9640387980; 5WS40002; 1570C0
• Other Numbers: 1570C0 / 5WS40002 / 9640387980 (common cross-references)

Installation Recommendations

• Work With A Cool Engine: Allow the engine to cool and work in a well-ventilated area away from open flames or sparks.
• Relieve Fuel Pressure: Before disconnecting fuel lines, relieve the fuel system pressure following the vehicle manufacturer’s procedure (for example, remove fuel pump fuse and crank or use dedicated pressure relief). Wear eye protection and gloves.
• Disconnect Electrical Connectors: Unplug injector electrical connectors and any sensors attached to the rail.
• Remove Intake Components If Required: In many applications the intake manifold or airbox must be removed or moved to access rail mounting bolts and fuel lines.
• Unbolt And Remove Rail With Injectors: Loosen the rail mounting bolts and fuel feed/return connections. Remove the rail assembly together with injectors where applicable to avoid damaging injector tips.
• Replace Seals And O-Rings: Always fit new injector O-rings and sealing washers. Lubricate O-rings with clean engine oil or recommended lubricant to avoid twisting or tearing during installation.
• Reassembly And Leak Check: Torque mounting bolts to manufacturer specs where available, reconnect electricals, re-pressurize the fuel system and inspect for leaks before starting. Run the engine and re-check for leaks and proper idling.
• Test Drive And Final Check: After installation, perform a short test drive and re-check all connections for seepage under operating conditions.

Most Common Failure Causes

• Deterioration Of Injector O-Rings And Seals: Heat and age cause O-rings to harden and crack, leading to external fuel leaks and pressure loss.
• Contamination And Deposits: Dirty fuel or contaminated injectors can cause uneven sealing and stress on the rail and injector interfaces.
• Corrosion Or Mechanical Damage: Corrosion from moisture or mechanical damage during previous servicing can compromise sealing faces or rail integrity.
• Pressure Regulator/High-Pressure Pump Issues: Upstream problems that create abnormal pressure spikes or drops can stress seals and fastenings, accelerating failure.

Practical Notes

This rail is typically replaced when fuel leaks are observed at injector seats or when loss of fuel pressure leads to rough running and fault codes. When replacing the rail, always inspect injectors and seals as a set to ensure a durable repair. Keep the part numbers handy (9640387980, 5WS40002, 1570C0) — many technicians and hobbyists search by these references when sourcing the correct rail for Citroën and Peugeot 2.0 HDi engines.