Description
Outlet pipe to BOSCH injection pump for 1.4 HDi and 1.6 HDi e-HDi engines
High-quality rail feed pipe designed for direct fitment on Citroën and Peugeot diesel engines equipped with Bosch high-pressure injection pumps. This feed tube (OE references 9684213880 / 1570Q3) supplies pressurised fuel from the high-pressure pump to the common rail assembly and is a frequently replaced item when leaks or pressure loss occur. Ideal for professional mechanics and experienced DIYers who need a reliable replacement part that restores proper fuel delivery and engine performance.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën Berlingo B9, Citroën C3 Picasso, Citroën C4 II, Citroën C4 Picasso, Peugeot 308, Peugeot Partner Tepee
- Product Codes: 9684213880, 1570Q3
- Additional Numbers: Compatible with Bosch high-pressure injection pump systems on 1.4 HDi and 1.6 HDi e-HDi engines
Application and Compatibility
The pipe is used on a range of Stellantis diesel models with Bosch injection hardware. Always match the OE part number (9684213880 / 1570Q3) with the part being replaced. Typical applications include 1.4 HDi and 1.6 HDi e-HDi engine families fitted to the listed Citroën and Peugeot models.
Function
The component transfers high-pressure fuel from the Bosch injection pump to the common rail or injector feed points. It must maintain sealing integrity under high pressure and temperature, ensuring stable rail pressure for correct injection timing and engine operation.
How To Replace
- Prepare the vehicle: work on a cooled engine in a well-ventilated area and relieve fuel system pressure according to manufacturer procedure.
- Access the line: remove any engine covers or intake components obstructing access to the injection pump and rail.
- Disconnect fittings: carefully loosen banjo bolts or compression fittings at both ends. Capture fuel spillage and clean connection faces.
- Replace seals: always fit new sealing washers/O-rings where specified. Do not reuse old seals.
- Install the new pipe: position the tube without forcing or bending; tighten fittings to the manufacturer torque settings if known.
- Bleed and check: prime the fuel system, start the engine and inspect for leaks. Verify proper idle and no error codes related to fuel pressure.
Installation Recommendations
- Use new sealing washers or O-rings at each connection to ensure leak-free joints.
- Avoid overtightening banjo bolts or compression fittings to prevent thread or tube damage.
- Clean mating surfaces thoroughly before assembly to prevent contamination of the high-pressure system.
- After installation, perform a pressure check and visual inspection while the engine is running to confirm there are no leaks.
- For high-pressure diesel systems, professional tools and experience are recommended. Observe fuel safety precautions and dispose of spilled fuel properly.
Why This Part Fails Most Often
Common failure causes include sealing ring deterioration, corrosion or pitting at connection points, mechanical damage from impacts or improper handling, and degradation from prolonged exposure to heat and vibration. Contaminated fuel or debris can also erode sealing surfaces, leading to leaks or pressure loss. Failures typically present as visible fuel leaks, loss of fuel pressure, rough idle or difficulty starting.
Notes For Professionals
This rail feed pipe is a routine replacement item during fuel system overhauls or when diagnosing low rail pressure and leaks on Bosch-equipped HDi engines. Matching the OE part number is the fastest way to find the correct replacement for the affected model.
