Description
Fuel Filler Neck Cap for Citroën and Peugeot Vehicles
Durable replacement fuel filler cap designed for Citroën and Peugeot vehicles, referenced under code 1508N7. This practical, easy-to-install cap restores a reliable seal to the fuel tank opening, prevents fuel evaporation and contamination, and helps avoid EVAP system faults. Suitable for professional workshops and experienced DIY mechanics who search by part number (1508N7) or by vehicle model.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: Peugeot 308 (T9), Peugeot 508
- Product Codes: 1508N7
- Other Numbers: No additional reference numbers provided
Fitment
Commonly fitted to specified Peugeot models above. Always confirm the part code 1508N7 against the vehicle’s existing cap to ensure correct fitment for trim and locking variant.
Function and Benefits
- Seals the fuel tank filler neck to prevent fuel vapour escape and contamination.
- Maintains correct pressure conditions within the EVAP system to avoid fault codes and check-engine lights related to fuel system leaks.
- Simple, cost-effective repair that restores fuel-system integrity and reduces fuel odours.
- Designed for OEM compatibility and direct replacement where the same part code is specified.
Installation Recommendation
Replacement is generally straightforward and can be performed in a few minutes by a trained mechanic or competent DIYer:
- Open the fuel filler door and remove the old cap by turning counterclockwise (or unlock first, if fitted with a lock cylinder).
- Inspect the filler neck threads and surrounding area for corrosion, deformation or debris; clean if necessary.
- Fit the new cap by aligning and turning clockwise until it seats securely; hear/feel the stop if the cap is threaded or click into place for locking/tethered versions.
- For locking fuel caps, ensure the lock cylinder matches the vehicle key or follow the vehicle manufacturer’s procedure for key pairing if required.
- After installation, start the vehicle and verify no lingering fuel odour and that the EVAP/fuel system warning light is not present. If a fault code persists, inspect the filler neck and sealing surfaces.
Why This Part Most Often Fails
- Ageing and degradation of the rubber seal or O-ring causing loss of tightness and vapour leaks.
- Cracks or breaks in the cap body due to impact, over-tightening or exposure to fuel and sunlight.
- Corrosion or damage to filler neck threads preventing proper seating of the cap.
- Lost or damaged locking mechanism (on keyed caps) from wear or forced removal.
Notes for Professionals
Mechanics and experienced technicians will appreciate the rapid replacement potential of this part. When replacing fuel system sealing components, always check adjacent parts (filler neck, tether, fuel door hinge) and the EVAP system for related faults to ensure a complete repair.
