CTS V8-5.7L VIN P (2004)
Refueling Vapor Recovery System: Description and Operation
ON-BOARD REFUELING VAPOR RECOVERY (ORVR) SYSTEM
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.