Smog Check Manual – Visual Inspection Practice Test

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How should a vehicle with a damaged gas-cap vent be treated?

Treat as a cap failure; the VI would fail until corrected.

A damaged gas-cap vent signals a failure in the evaporative emissions control system’s sealing and venting path. In a visual inspection, the gas-cap area must show a proper seal and intact venting to prevent fuel vapors from escaping. If the vent is damaged, the system can’t reliably control vapors, so it’s treated as a cap failure and the vehicle would fail the VI until the issue is corrected. The repair typically involves replacing or repairing the cap/vent to restore a proper seal, after which the vehicle can be retested. This isn’t something to proceed with or ignore, because a damaged vent can still emit vapors and fail emissions standards even if no liquid leak is evident.

Proceed with the VI while monitoring the cap.

Only replace the cap if a leak is detected.

Ignore the issue and continue.