GM 23481275 Vent Assembly, Evap Emission Canister

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The EVAP system is used to lessen the chances of fuel system vapors, which contains unburn hydrocarbons, being released to the atmosphere. During hot weather, fumes in the fuel tank evaporate and, when the pressure is increased to a specific level, the fuel vapor vent valve and the fuel vapor control valve open to pump the vapors to the EVAP canister where they are temporarily stored until they can be burnt by the engine. The canister purge solenoid is opened by PCM under certain circumstances and the vapors produced are admitted into the intake manifold to be burnt with the air/fuel mix. The EVAP canister is a chamber which is mounted under the car but is full of activated charcoal and does not require any service. Fuel tank pressure sensor checks tank pressure and transmits with PCM during leakage tests. The vent solenoid is ON but isolates the system for the testing The canister purge solenoid is closed or opened by PCM depending on the signals from the intake manifold vacuum, sensor data that decides vapor flow. Some of the signs of EVAP system malfunction include fuel smell, poor start or idle, stalling, difficulty in accelerating and driving, and these are often as a result of defective vapor hoses and or fuel tank. To test for elements such as high fuel vapor pressure, the valve can be opened by taking off the gas cap in order to listen for pressure relief hissing. The other element of air intake service process is rather simple and consists in the removal of air intake duct, detachment of electrical connectors and quick-connect fittings, and the reconnection and installation of the air intake duct in the reverse order. The EVAP canister and the fuel tank pressure sensor, need the car to be lifted and supported on jack stands for removal and installation.

To remove the EVAP canister purge solenoid on a V6 model, start by removing the air intake duct and disconnecting the electrical connector and EVAP purge line quick-connect fitting from the solenoid. Then, remove the mounting nut and the solenoid itself. For a V8 model, follow the same steps but also cap both EVAP purge lines before disconnecting the inlet purge line quick-connect fitting. To remove the EVAP canister vent solenoid, disconnect the electrical connector and quick-connect fittings from the solenoid and remove it from its mounting bracket. To remove the EVAP canister, label and disconnect all EVAP hoses connected to it, remove the mounting nut, and remove the canister from its bracket. Finally, to remove the fuel tank pressure sensor, remove the fuel tank and the sensor from the fuel pump/fuel level sending unit mounting flange. Installation for all components is the reverse of removal.

To remove the EVAP canister vent solenoid, start by disconnecting the electrical connector and quick-connect fittings from the solenoid. Then, remove it from its mounting bracket.

To remove the EVAP canister vent solenoid, start by disconnecting the electrical connector and quick-connect fittings from the solenoid. Then, remove it from its mounting bracket.

To remove the EVAP canister vent solenoid, start by disconnecting the electrical connector and quick-connect fittings from the solenoid. Then, remove it from its mounting bracket.