Description
Fuel rail for 2.2 HDi 125 kW engines. Includes fuel pressure regulator – the plastic is cracked, needs to be taped. Includes fuel pressure sensor. Fully sealing.
Product Overview
This fuel rail (common rail) is intended for PSA 2.2 HDi 125 kW diesel engines used in a range of Citroën and Peugeot models. The assembly includes the fuel pressure regulator and the fuel pressure sensor. The rail ensures stable high-pressure fuel delivery to the injectors and is a direct-fit part for specified applications. Typical search references and OE numbers are included to help technicians and DIYers find exact matches.
Compatibility / Intended Models
- Citroën C‑Crosser
- Citroën C5 (including X7 variants)
- Citroën C8
- Peugeot 4007
- Peugeot 407
- Peugeot 807
Technical Information
- Manufacturer: Bosch / Stellantis (OEM for Citroën/Peugeot)
- Model: Rail for 2.2 HDi 125 kW engines
- Product Codes: 0281002803
- Additional Numbers: 9656917280, 9654748880, 1570L3
Function And Benefits
The fuel rail distributes high-pressure diesel to each injector with minimal pressure loss. The integrated pressure regulator maintains the correct rail pressure for proper injection timing and quantity, while the pressure sensor provides feedback to the ECU for closed‑loop fuel control. A properly functioning rail improves driveability, reduces smoke and rough idling, and ensures efficient combustion.
Installation And Replacement
Replacement of the fuel rail should be performed by a competent technician or an experienced DIYer who follows diesel system safety procedures. Typical steps include depressurising the fuel system before opening (crucial to avoid spray), disconnecting the battery, removing engine covers and intake components for access, disconnecting fuel lines and electrical connectors for the pressure sensor and regulator, removing injector retaining hardware if required, fitting the new rail with fresh injector seals/O‑rings, and reconnecting all lines and connectors. After installation, check for leaks and perform engine start checks to confirm correct pressure and operation.
Mounting Recommendations
- Always relieve fuel pressure before disconnecting any fuel line.
- Replace injector O‑rings and seals when installing the rail to ensure leak‑free joints.
- Use manufacturer torque values and follow the tightening sequence for rail and injector clamps (refer to factory manual for exact values).
- Inspect fuel pipes and banjo bolts for damage or corrosion; replace crush washers where fitted.
- Verify electrical connections to the pressure sensor and regulator are clean and secure before start‑up.
Why This Part Most Commonly Fails
Common causes of fuel rail issues include contamination in the fuel (leading to stuck injectors or damaged pressure components), prolonged exposure to heat and vibration that can crack plastic elements (notably the pressure regulator housing), corrosion on metal fittings, and wear of injector O‑rings causing pressure loss. In this specific unit the plastic on the fuel pressure regulator is cracked and has been temporarily secured with tape; this can lead to pressure instability or ingress of contaminants if not addressed.
Important Notes For Technicians
- Search by product numbers (0281002803, 9656917280, 9654748880, 1570L3) to confirm fitment for the exact engine and model year.
- After replacement, always check the system for leaks and proper rail pressure before road testing.
