Description
Supply Pipe To Injector – 4th Cylinder
For RAIL 1.5 HDi In Citroën, Peugeot, Fiat, Toyota, Opel Vehicles
High-pressure injector supply pipe for the 4th cylinder, designed for Common Rail 1.5 HDi applications. This genuine-design fuel line (part number 9825615580) delivers precise, leak-free fuel flow between the common rail and the injector. Built for workshops and experienced DIY mechanics, the pipe is suitable for engine repairs, injector replacement or rail servicing on a range of Stellantis Group cars and selected Fiat, Toyota and Opel models that use the 1.5 HDi common-rail system.
Technical Information
- Manufacturer: Stellantis
- Model(s): RAIL 1.5 HDi applications (Citroën, Peugeot; also found on some Fiat, Toyota, Opel vehicles)
- Product Codes: 9825615580
- Other Numbers: Not available / No additional cross-references provided
Function
The high-pressure supply pipe transfers fuel from the common rail to the 4th cylinder injector at system operating pressure. It is a precision component in the high-pressure circuit; correct sealing and integrity are essential to maintain injection timing, engine performance and safety.
Typical Failure Modes
This pipe most commonly fails due to:
- Corrosion and pitting from age and environmental exposure on external surfaces or fittings.
- Mechanical damage caused by impact, improper routing or contact with other components during servicing.
- Leaking due to degraded or incorrectly fitted sealing washers (copper crush washers) at the unions.
- Fatigue from engine vibration or repeated removal and reinstallation without replacing seals.
Replacement Frequency
There is no fixed interval for replacement. Pipes are typically replaced when leaking, after injector or rail replacement, or if physical damage/corrosion is detected during service. Inspect during any injector or rail work and replace if corrosion, cracks or persistent leaks are present.
Installation Recommendations
Follow these practical steps to ensure a safe, reliable replacement:
- Depressurize the fuel system before starting work (follow the vehicle manufacturer’s procedure).
- Work in a clean area to avoid contaminating the injector or rail with dirt or debris.
- Remove engine covers and any components obstructing access to the rail and injector.
- Always fit new copper crush washers/seals at both ends of the high-pressure union. Do not reuse old washers.
- Hand-start union nuts to avoid cross-threading, then tighten to the manufacturer’s torque specification—consult the workshop manual for exact values.
- After installation, check for leaks at idle and under load. Re-torque if permitted by the workshop manual.
- Dispose of fuel-soaked rags and old parts safely and in accordance with local regulations.
Replacement Procedure (Overview For Experienced Technicians)
- Relieve fuel pressure and isolate the high-pressure system.
- Disconnect low-voltage connectors only if necessary and remove obstructing engine covers.
- Loosen and remove the union nuts on the rail and injector, replace crush washers and fit the new pipe.
- Reassemble components, prime the fuel system if required, start the engine and inspect for leaks.
Note: Always follow the vehicle manufacturer’s workshop manual for detailed procedures and torque settings. Improper installation may cause leaks, poor engine performance or component damage.
Why Choose This Part
Part number 9825615580 is specified for the 4th cylinder on 1.5 HDi Common Rail engines and is an economical, direct-fit solution when replacing a damaged or leaking high-pressure pipe. Correct replacement restores fuel integrity and engine performance, reducing smoke, rough idle and potential safety hazards from high-pressure leaks.
