Description
Outlet pipe to the BOSCH injection pump for 1.4 HDI and 1.6 HDI eHDI engines.
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)
- Depressurize the fuel system following manufacturer guidance before starting work.
- Clean the surrounding area to prevent contamination entering the high-pressure circuit when fittings are opened.
- Remove retaining bolts and carefully detach the old pipe. Replace all sealing elements (O-rings/crush washers) with new parts.
- 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).
- 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.
