EVAP Canister Purge Regulator Valve
The primary function of the EVAP system is
to trap fuel vapor created by the fuel in the
The EVAP Canister Purge Regulator Valve is an electromagnetic solenoid valve that can be pulsed to allow a variable percentage of fuel vapor to enter the intake manifold.
The EVAP Canister Purge Regulator Valve is controlled by the ECM.
Based on information from the Oxygen Sensors about the fuel to air ratio in the exhaust, the ECM opens the EVAP Canister Purge Regulator Valve and allows vapor from the EVAP Canister to be drawn into the Intake Manifold.
As air is now drawn in through the EVAP Vent, it is passed back through the activated carbon that holds the fuel vapor. The fuel vapor separates from the activated carbon and combines with the air.
This fuel vapor/air mixture is drawn through the vent line, through the EVAP Canister Purge Regulator Valve and into the Intake Manifold.
The EVAP Canister Purge Regulator Valve is modulated so that the right amount of fuel vapor is allowed to enter the Intake Manifold.
EVAP Canister Purging
The volume of air and fuel vapor entering the Intake Manifold from the EVAP Canister can change how the engine runs. The ECM has to constantly monitor the Mass Air Flow sensor and the Oxygen Sensors to determine the air to fuel ratio.
A 1% concentration of fuel vapor from the EVAP Canister can vary the air/fuel mixture by as much as 20%. This can have a drastic effect on engine driveability and vehicle emissions.
Also, the EVAP Canister can be fully purged, sending only air through to the Intake Manifold. This can cause a lean condition.
As the ECM monitors the inputs from its sensors, it will either increase or decrease the signal to the EVAP Canister Purge Regulator Valve. This controls the purge rate for best efficiency under all operating conditions.
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