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    1. Junior Member
      Join Date
      May 19th, 2009
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      NYC
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      2008 Candy White Wagon FSI
      03-20-2017 01:19 PM #1
      Hi,

      I have a 2008 FSI Wagon (with about 55K) and for the past 3-4 months I've been having Gas Cap Light popping up once or twice a month. The light goes away if I drive for a a bit (at least 10-15 minutes) shut the engine off and start the car again but it doesn't go away if I turn the car off immediately and tighten the gas cap. I drive mostly on weekends, so it may be affecting the frequency. Thoughts? (I haven't had the codes checked but plan on asking the shop I go to when I go for spring check up)

      Thank you.

    2. Member Soundwave_vr6's Avatar
      Join Date
      Sep 30th, 2007
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      Ontario
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      3.6 4mo
      03-20-2017 04:50 PM #2
      take a look at the o ring on the cap. if its all cracked get a new cap.

    3. 03-20-2017 08:37 PM #3
      Could be N80 valve. I was having the gas cap fault so I replace my N80 valve. Hasn't been back since.

    4. Junior Member
      Join Date
      May 19th, 2009
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      NYC
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      2008 Candy White Wagon FSI
      03-21-2017 09:26 AM #4
      Thank you.

    5. Member
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      May 15th, 2012
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      LA
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      01 FrankenGTI, 12 Tiglean (wife) 08 r36'ish ;-)
      03-21-2017 10:30 AM #5
      I didn't have a dash light but the evap system kept showing up in the VCDS scans.. Bought a new gas cap and lost it in the move (it's packed somewhere) so changed the n80 valve while looking for that ____ gas cap. No issues since.

    6. Member 10001110101's Avatar
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      Aug 7th, 2007
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      Monticello, MN
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      B6 Lux Wagon, 2010 F-Juan Fitty
      03-21-2017 01:11 PM #6
      Thirded on the N80 valve. I changed my gas cap first and it did not fix the problem. N80 changed in 10 minutes and no light since.

    7. Junior Member
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      May 19th, 2009
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      NYC
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      2008 Candy White Wagon FSI
      04-12-2017 09:37 AM #7
      Confirmed, it was N80 valve. A CEL popped up over the weekend which also was caused by the valve.

      Thank you, all.

    8. Member Soundwave_vr6's Avatar
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      Sep 30th, 2007
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      3.6 4mo
      04-13-2017 07:42 AM #8
      already replaced cap. new n80 on its way today. hope to have same luck as everyone else.

      tired of random check engine lights

    9. Member Soundwave_vr6's Avatar
      Join Date
      Sep 30th, 2007
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      3.6 4mo
      05-26-2017 07:55 AM #9
      been a few tanks no light. purge valve fixed mine too

    10. Yesterday 11:44 AM #10
      Same issues - replaced my gas cap with a new one for $31 which did not solve the problem. Old gas cap was in poor condition anyway so this still was beneficial in my opinion. After another MIL light I hooked up VCDS and identified the N80 valve as being bad. Purchased a new one for $13 with clamps $2 and solved the problem permanently. The one interesting fault which pointed to the N80 being bad was difficulty starting after filling up with fuel - the cylinders would be too rich since the gas vapors in the tank were being pushed directly into the intake plenum and cylinders since the N80 was not closed and blocking.

      31-Oct-16 oil and filter 125k service

      Ordered from Amazon

      Liqui Moly 2332 Leichtlauf High Tech 5W-40 Engine Oil - 5 Liter $38.19
      Mann-Filter HU 719/6 X Metal-Free Oil Filter $11.32

      Installed gas cap (3C8201550E) purchased from ECS Tuning for $31




      04-Apr-17

      Purge valve changed at 135k. Purchased at ECS Tuning for $13 plus clamps $2

      Old valve - must have been changed previously - note screw clamps


      New and old valves appear to be physically identical


      New and old valves appear to be physically identical


      New valve installed with proper clamps

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