why does my 1999 vw jetta "bog" down when i take the gas cap off?

Asked by Jan 08, 2013 at 07:54 PM about the 1999 Volkswagen Jetta GL

Question type: Maintenance & Repair

1 Answer

96,885

The fuel system is pressurized for emissions control. When you remove the fuel cap, it loses the pressure. If you have a bad seal on the cap, you could get a service light on the dash in some cars.

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