I've failed for the gas cap before and now I always go out and buy a new one before going through inspection. After I pass, I put the old one back on and keep the new one in the box until the next inspection. It's such a stupid thing to fail for. They should allow you to go to the back door with the new cap to test and pass it.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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