The EONV (Engine Off Natural Vacuum)test Is Being Discussed

question 17

Multiple Choice

The EONV (engine off natural vacuum) test is being discussed. Technician A says that to perform it, the PCM is kept powered for up to 4 minutes after the ignition switch is turned off. Technician B says that the natural vacuum created in the fuel tank as the engine cools, is from about 3 inches to about 5 inches of water.  Who is correct?

• A)Technician A only
• B)Technician B only
• C)Both A and B
• D)Neither A nor B

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Definitions:

Contaminated Property

Real estate that has been polluted or has hazardous materials present, making it potentially dangerous and less valuable.

Federal Law

Legislation enacted by the national government or Congress of a country. In the United States, these laws apply to all states.

Clean Air Act

A comprehensive federal law in the United States that regulates air emissions from stationary and mobile sources to protect public health and the environment.

Stationary Sources

Fixed sites or facilities that emit pollutants into the air, such as power plants, manufacturing facilities, and refineries.