Description
Fuel injection supply pipe to the first cylinder for the RAIL in 1.4 HDi and 1.6 HDi e-HDi engines.
Product Overview
This is a direct-fit fuel supply pipe (part number 1570P9) for the high-pressure RAIL feeding the first cylinder on Citroën and Peugeot 1.4 HDi and 1.6 HDi e-HDi diesel engines. Designed for professional workshops and competent DIY mechanics, this pipe restores correct fuel routing and sealing at the injector/rail interface to maintain stable rail pressure and reliable starting, idling and performance.
Function And Application
The pipe conveys high-pressure diesel from the common-rail to the injector of cylinder 1. It must resist high injection pressures, temperature cycles and vibration while keeping a leak-free seal at connections. Correct replacement prevents pressure loss at the rail, reduces the risk of misfires and avoids fuel leaks that can lead to poor engine performance or safety hazards.
Symptoms Of A Faulty Pipe
- Visible fuel leak at the rail or injector area.
- Hard starting, rough idle or misfires on cylinder 1.
- Loss of rail pressure leading to loss of power or poor fuel economy.
- Strong smell of diesel around the engine bay.
Replacement Procedure (Overview)
- Depressurize the fuel system before any work to avoid spray of high-pressure diesel.
- Protect surrounding components and clean the working area to prevent contamination of the injection system.
- Use two appropriate wrenches when loosening fittings to avoid twisting the rail or injector.
- Always renew sealing elements (crush washers/olives or sealing rings) according to manufacturer practice; do not reuse old seals.
- Refit the new pipe and tighten fittings to the manufacturer’s torque specification.
- Prime the fuel system and check for leaks at operating pressure; run the engine and verify stable rail pressure and absence of fault codes.
Installation Recommendations
- Perform installation in a clean, well-lit environment to avoid contamination of the common-rail system.
- Use dedicated fuel-line tools where needed and follow the vehicle manufacturer’s tightening sequence and torque values.
- Replace sealing washers or olives every time the connection is opened.
- After fitting, bleed the system and inspect for leaks at idle and under load. Address any leak immediately.
- If unsure about bleeding or priming procedures, have the final check performed by a trained technician.
Most Common Failure Reasons
- Corrosion and material fatigue from long-term exposure to heat, vibration and road salt.
- Mechanical damage during previous maintenance or engine work (bent or cracked pipe).
- Failed or degraded sealing washers leading to slow or sudden leaks.
- Improper installation or incorrect torque causing loosening or pinching of the pipe.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: 1.4 HDi, 1.6 HDi e-HDi Engines
- Product Codes: 1570P9
- Other Numbers: N/A
Who Should Fit This Part
Intended for professional auto technicians and experienced DIY mechanics familiar with common-rail diesel systems. Proper handling, correct sealing and correct torque are essential for safe and reliable operation.
