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Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls - 5.7L - Introduction) >> Description and Operation >> Fuel System Description >> On-Board Refueling Vapor Recovery (ORVR) System

On-Board Refueling Vapor Recovery (ORVR) System

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The on-board refueling vapor recovery (ORVR) system is an on-board vehicle system to recover fuel vapors during the vehicle refueling operation. The flow of liquid fuel down to the fuel tank filler neck provides a liquid seal. The purpose of ORVR is to prevent refueling vapor from exiting the fuel tank filler neck.

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