Product Overview

This high-pressure outlet pipe (rail feed) is an OEM-style replacement part used on PSA diesel engines with BOSCH injection pumps. It connects the pump outlet to the high-pressure fuel rail/lines and is commonly referenced by part numbers 9804226780 and 1570Q3. The pipe is a wear-and-tear component in the fuel delivery system and is frequently searched for by its product codes, making it easy to find for mechanics and DIY enthusiasts.

Key Benefits

• Direct Replacement For Original Equipment: Designed to match the dimensions and sealing interfaces of the original PSA/BOSCH installation.
• Fuel System Integrity: Restores secure high-pressure connection between the injection pump and fuel rail, preventing leaks and pressure loss.
• Quick Identification: Commonly listed under OE numbers 9804226780 and 1570Q3 for fast lookup and ordering.

Compatible Vehicles

Suitable for PSA 1.4 HDi and 1.6 HDi / e-HDi diesel engines installed in various Citroën and Peugeot models. Examples of frequently compatible cars include Citroën C2, C3, C4, Berlingo and Peugeot 206, 207, 307, 308, Partner. Always verify fitment against the part number before installation.

Function And Typical Failure Modes

Function: The outlet pipe conveys high-pressure fuel from the BOSCH injection pump to the common rail or the high-pressure distribution line. It must maintain a leak-free, mechanically secure connection under extreme pressure and temperature cycles.

Why It Fails: Common causes of failure include sealing ring (O-ring) deterioration, corrosion, mechanical damage from vibration or impact, and fatigue cracking at bends or joints. Contaminated fuel or improperly torqued fittings can accelerate wear and cause leaks. Failure typically presents as visible fuel leakage, loss of fuel pressure, engine misfire, or fault codes related to fuel pressure.

Replacement Procedure (Summary)

1. Depressurize the fuel system following manufacturer guidance before starting work.
2. Clean the surrounding area to prevent contamination entering the high-pressure circuit when fittings are opened.
3. Remove retaining bolts and carefully detach the old pipe. Replace all sealing elements (O-rings/crush washers) with new parts.
4. Install the new pipe, making sure mating surfaces are clean and seals are correctly seated. Tighten fittings to the manufacturer’s torque specifications (consult the workshop manual).
5. Prime the fuel system and check for leaks at idle and under load. Clear any related fault codes if necessary and inspect for proper fuel pressure and engine response.

Maintenance And Practical Tips

• Always fit new O-rings or sealing washers when replacing the pipe to ensure long-term leak-free operation.
• Avoid overtightening metal-to-metal fittings; use torque specs from the repair manual.
• Keep the fuel system clean during service—dirt or metal particles can damage the high-pressure pump and injectors.
• If the vehicle shows low fuel pressure or persistent leaks after replacement, recheck fittings, seals, and the state of the injection pump and rail for secondary damage.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën and Peugeot 1.4 HDi and 1.6 HDi e-HDi Engines
• Product Codes: 9804226780, 1570Q3
• Other Numbers: No Additional Numbers Provided

Installation Recommendations

Recommended For Mechanics And Experienced DIYers: Replacement requires care with high-pressure diesel components. Use clean tools, new seals, and follow the vehicle manufacturer’s assembly sequence and torque values. After installation, prime the system and inspect thoroughly for leaks before test driving.

Why This Part Is Often Replaced

Age, heat cycling and contamination cause seals to harden and metal pipes or fittings to corrode or crack. Because the part operates under very high pressure, even small seal failures lead to noticeable leaks or pressure loss, prompting replacement.

Ordering And Identification

Searchable By Part Number: 9804226780 and 1570Q3. When ordering, use these codes to ensure you receive the correct outlet pipe for the BOSCH injection pump fitted to PSA 1.4/1.6 HDi engines.

For a reliable repair, choose the correct rail outlet pipe and replace associated seals and hardware at the same time to restore the fuel system to safe, leak-free operation.

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.