Description
Outlet pipe to the BOSCH injection pump for 1.4 HDi and 1.6 HDi eHDI engines
This high-pressure rail pipe is an original-style replacement designed for the fuel supply between the Bosch injection pump and the common rail on 1.4 HDi and 1.6 HDi e-HDi engines. The part is commonly referenced under OEM numbers 9684213880 and 1570Q3 and is suitable for a range of Citroën and Peugeot models. Built to withstand the demands of modern diesel injection systems, it ensures reliable fuel delivery and helps maintain correct rail pressure and engine performance.
Application And Fitment
Fits popular PSA Group models equipped with 1.4 HDi or 1.6 HDi e-HDi engines, including but not limited to:
- Citroën Berlingo B9
- Citroën C3 Picasso
- Citroën C4 II
- Citroën C4 Picasso
- Peugeot 308
- Peugeot Partner Tepee
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: 1.4 HDi, 1.6 HDi e-HDi
- Product Codes: 9684213880, 1570Q3
- Other Numbers: OEM Reference 9684213880 | 1570Q3
Function And Benefits
The rail/feed pipe carries high-pressure diesel from the Bosch injection pump to the fuel rail or between rail components. A correctly functioning pipe is critical for maintaining injection pressure, accurate fuel metering and stable engine running. Using the correct OE-style pipe reduces the risk of leaks, pressure loss and subsequent drivability issues.
Common Failure Causes
High-pressure fuel pipes can fail for several reasons: corrosion and rust on the fittings, mechanical damage from road debris or improper handling, fatigue from vibration and thermal cycles, and deterioration of sealing washers or ferrules. Small leaks at connections may lead to pressure drop, rough idle, reduced power or fuel odor in the engine bay. Contaminated fuel and incorrect installation torque are frequent contributors to premature failure.
Installation Recommendations
- Work Should Be Performed By A Trained Technician Familiar With High-Pressure Diesel Systems.
- Relieve Fuel System Pressure Before Any Work. Take Basic Safety Precautions: no open flames, proper ventilation and eye protection.
- Replace Sealing Washers Or Crush Rings At Each Connection; Do Not Reuse Old Seals.
- Clean Connection Areas To Avoid Contamination Entering The Fuel System.
- Tighten Connections To Manufacturer Torque Specifications. After Installation, Check For Leaks With The Engine Running And Recheck Torque After A Short Test Drive.
- If In Doubt, Use OEM Parts And Follow The Vehicle Manufacturer Service Manual.
Why Replace This Part
Replace the rail pipe if you observe visible fuel leaks, fuel smell in the engine bay, loss of power, misfires, or if the pipe or its fittings show corrosion or mechanical damage. Regular inspection during scheduled maintenance helps detect early signs of wear and prevents more costly damage to the pump or injectors.
Additional Notes
When servicing high-pressure fuel components, maintain cleanliness and handle fittings carefully to avoid bending or stressing the pipe. Using the correct replacement part by OEM reference 9684213880 / 1570Q3 ensures proper fit and long-term reliability for Citroën and Peugeot diesel models listed above.
