2006 Chevy Silverado tighten fuel cap warning

Tiny
BOLTONR
  • MEMBER
  • 2006 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 28,000 MILES
I got a tighten fuel cap warning and then the check engine light came on. Tightening the fuel cap did not fix the problem, so I bought an OEM replacement which immediately fixed the problem for about one month and 500 miles of driving. Now I have the same problem.
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Friday, May 7th, 2010 AT 7:40 AM

1 Reply

Tiny
BLUELIGHTNIN6
  • EXPERT
There are all sorts of things that can cause that issue. The evaporative emissions system runs a test to ensure no fuel vapors are escaping into the atmosphere. The vehicle simply assumes the gas cap is loose based on the rate of leakage. It could be a leak at the filler neck, tank itself and/or any of the evap valves. This doesnt mean it leaks fuel, but rather fuel vapors from the emissions system.
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Friday, May 7th, 2010 AT 11:30 AM

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