Sable V6-183 3.0L VIN U FI (1998)
Canister Purge Control Valve: Description and Operation
The Evaporative Emission canister purge valve (EVAP canister purge valve):
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regulates the purging of the Evaporative Emissions canister (EVAP canister).
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is controlled by the Powertrain Control Module (PCM).
During refueling the fuel vapors are routed:
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from the fuel tank through the fuel tank mounted fuel vapor control valve.
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to the evaporative emissions canister.
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when the fuel tank is at its rated capacity, the fuel level rises to close the fuel tank mounted vapor control valve.
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the pressure in the fuel tank will rise and cause the fuel dispensing nozzle to shut off.