What is the consequence of a disconnected purge line in EVAP during VI?

• A. It has no effect on the VI.
• B. It improves fuel economy during testing.
• C. Potential fuel vapor leaks; VI fails.
• D. The vehicle fails only if a leak is detected in the intake manifold.

Answer: (C)

A disconnected purge line creates a direct path for fuel vapors to escape rather than being routed to the engine to be burned. That means a fuel vapor leak is present, which the Visual Inspection checks for. Because the EVAP system must be sealed and properly connected, seeing a disconnected purge line indicates the system is not contained and emissions control is compromised. This is why the VI would fail. It isn’t about improving fuel economy, and the problem isn’t limited to leaks at the intake manifold—the open line itself is a leak that fails the inspection.