Description
Fuel Filler Neck Cap for CITROËN and PEUGEOT Vehicles
This replacement fuel filler cap (part code 1508N7) is designed for Citroën and Peugeot passenger cars. It seals the fuel tank inlet, preventing fuel vapour loss, dirt ingress and moisture contamination. Correct sealing of the filler cap helps maintain the integrity of the vehicle Evaporative Emission (EVAP) system and can prevent related fault codes and drivability warnings. The cap is a practical spare for workshops and DIY mechanics who need a direct, reliable replacement that fits the original filler neck arrangement used on many Stellantis models.
Technical Information
- Manufacturer: Stellantis
- Model: Fits Various Citroën And Peugeot Models — Common Fitments Include Peugeot 308 (T9) And Peugeot 508
- Product Codes: 1508N7
- Additional Numbers: No Additional Numbers Available
Function And Benefits
The fuel filler cap provides a gas-tight seal between the fuel tank and the atmosphere. It prevents fuel vapour emissions, reduces risk of contamination entering the tank during refuelling and maintains correct pressure balance in the EVAP circuit. A properly sealing cap helps avoid check-engine lights related to the EVAP system and contributes to fuel system safety.
Installation Recommendations
- Replacement is straightforward: open the filler flap, remove the old cap (typically by unscrewing or releasing spring clips depending on design) and fit the new cap until it seats and locks. Ensure the sealing surface is clean and free of debris before installation.
- Do not over-tighten; turn until the cap seats and clicks (if applicable) or until hand-tight. Over-tightening can damage threads or the sealing gasket.
- After installation, check for secure fit and ensure the filler flap closes properly. Start the engine and verify that no EVAP or fuel system warning lights remain illuminated.
- Observe standard safety precautions when working near fuel: no open flames or smoking, avoid sparks and work in a well-ventilated area.
Most Common Failure Causes
- Worn Or Compressed Seal: Rubber gasket degrades over time from fuel exposure, heat and ozone, leading to poor sealing and EVAP leaks.
- Cracked Or Brittle Plastic: UV exposure and age can make the plastic cap brittle and prone to cracking.
- Broken Tether Or Locking Mechanism: Tether clips or locking features can snap from repeated use or impact, preventing proper closure.
- Contamination On Sealing Surface: Dirt or debris on the filler neck or cap seal prevents a tight fit and can trigger EVAP system faults.
Service Life And Replacement Guidance
There Is No Fixed Replacement Interval; Replace The Cap If The Seal Is Damaged, The Cap Is Cracked, The Tether/Locking Mechanism Is Faulty Or If The Vehicle Displays EVAP-Related Faults After Other Checks. Regular Inspection During Routine Servicing Is Recommended.
Why Choose This Part
Designed As A Direct Replacement Identified By Part Code 1508N7, This Cap Offers A Fast, Cost-Effective Repair For Fuel System Sealing Issues On Compatible Citroën And Peugeot Models. It Is Suited For Professional Workshops And Home Mechanics Who Require A Reliable Spare Part To Restore Proper EVAP Function And Prevent Fuel System Warnings.
