Description
Fuel Filler Cap For CITROËN And PEUGEOT Vehicles
Overview
This OEM-style fuel filler cap (part number 1508N1) is designed for Citroën and Peugeot models, offering a reliable seal for the fuel tank to prevent evaporation, contamination and pressure loss. Suited for professional garages and experienced DIYers, the cap is a direct-fit replacement for common applications on Citroën C5, Citroën C6 and Peugeot 407 where this part number is referenced. Including the part number 1508N1 in searches will improve findability when sourcing the correct item.
Key Benefits
- Exact fit for vehicles using part number 1508N1 — simplifies installation and reduces adjustment time.
- Restores proper tank sealing to avoid fuel vapour leakage and fuel system fault codes.
- Durable construction resistant to fuel exposure and weathering for long service life.
- Ideal for workshops and skilled DIYers performing routine maintenance or replacing damaged caps.
Technical Information
- Manufacturer: Stellantis
- Model: Citroën C5; Citroën C6; Peugeot 407
- Product Codes: 1508N1
- Additional Numbers: Not Available
Function And Application
The fuel filler cap provides a sealed closure for the fuel tank inlet. Its primary functions are to maintain correct evaporative emissions control, keep contaminants out of the fuel system, and preserve the slight pressure/vacuum balance required by the fuel tank and EVAP system. On some vehicles a locking mechanism is fitted; on others the cap is non-locking. Replace like-for-like depending on the vehicle specification.
Replacement Procedure (General Guidance)
- Park the vehicle on level ground and switch off the engine.
- Open the fuel filler door and remove the old cap by turning it counterclockwise (for screw-type caps) or by releasing the locking catch if fitted.
- Inspect and clean the filler neck sealing surface; remove dirt, debris and corrosion that could prevent a proper seal.
- Fit the new cap, ensuring the sealing face and any O-ring are correctly seated. Tighten until secure — for screw-type caps, turn until it clicks or is hand-tight as specified by the manufacturer.
- Verify the filler door closes correctly and check the dashboard for any fuel-system warnings after a short drive.
Installation Recommendations
- Use basic hand tools; no complex programming is required for standard non-electronic caps.
- For locking caps, keep track of keys and ensure the lock cylinder matches the vehicle’s set if replacing a keyed cap.
- Always clean the sealing surfaces before fitting. Replace any damaged O-rings or retainers to ensure a long-lasting seal.
- If a persistent fuel odor or evaporative system warning lamp remains after replacement, inspect the filler neck and EVAP components for additional faults.
Why This Part Fails (Common Causes)
- Degraded Rubber Seal: Over time, the gasket or O-ring hardens or cracks, causing poor sealing and fuel vapour leaks.
- Mechanical Damage: Impacts at the filler door or mishandling during refuelling can crack the cap or break the hinge/locking mechanism.
- Corrosion And Dirt: Corrosion on the filler neck or buildup of debris prevents a proper seal.
- Wear From Frequent Use: Repeated opening/closing and cross-threading can wear the threads or locking tabs.
Notes For Buyers
Search using the part number 1508N1 or the vehicle models listed to ensure quick identification. This product is intended as a direct-fit replacement where the same specification cap is required. Suitable for both professional fitment and competent DIY installation.
