Which condition would NOT cause a vehicle to fail the large leak test in an enhanced EVAP system?

In an enhanced Evaporative Emission Control (EVAP) system, the large leak test is designed to check for significant leaks that would allow fuel vapors to escape into the environment. The system typically detects leaks greater than a specified threshold, often in the range of 0.010 inches in diameter or larger.

A stuck open canister purge valve does not significantly contribute to a vehicle failing the large leak test because it allows a controlled flow of vapors from the charcoal canister to the engine for combustion. While having the purge valve stuck open can affect the overall operation of the EVAP system and might lead to issues such as poor drivability or increased emissions during certain operating conditions, it would not introduce a large enough leak to cause a failure in the large leak test specifically designed to check for substantial leaks in the system.

In contrast, a loose fuel cap, cracked vapor line, or stuck open canister vent solenoid would indeed create significant pathways for vapors to escape, making them likely causes for a failure in the large leak test. The loose fuel cap can create a substantial opening that allows vapors to escape, while a cracked vapor line introduces a breach that would certainly exceed the leak detection threshold. A stuck open canister vent sol