Propane can be used to locate the sources of vacuum leaks.

Name: Propane can be used to locate the sources of vacuum leaks.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Propane can be used as a test gas to locate the sources of vacuum leaks in an engine. When propane gas is introduced to the engine's intake system, it will be pulled into any areas where there is a vacuum leak, causing a change in the engine's idle speed or RPM. This method is commonly used by mechanics to quickly locate and diagnose vacuum leaks.

Propane Can Be Used to Locate the Sources of Vacuum