Chevrolet 15137022 Canister Assembly, Evap Emission

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The Evaporative Emissions Control (EVAP) system is designed to prevent fuel system vapors, containing unburned hydrocarbons, from escaping into the atmosphere. On warm days, trapped vapors in the fuel tank expand, and when pressure reaches a threshold, they are routed through valves to the EVAP canister for temporary storage. When conditions are right, the Powertrain Control Module (PCM) opens the canister purge solenoid, allowing vapors to be drawn into the intake manifold and consumed by the engine. The EVAP canister, typically maintenance-free, is located either on top of the fuel tank (1996-2002) or underneath the vehicle (2003 and later). The EVAP canister vent valve, normally open, seals the system for testing and pressure checks and is situated near the canister. The EVAP system fuel tank pressure sensor, on top of the fuel tank, monitors vapor pressure. The EVAP canister purge solenoid, controlled by the PCM, regulates vapor flow into the intake manifold. Common issues include fuel odors, poor idle, stalling, and driveability problems. Excessive fuel vapor pressure can be checked by removing the gas cap. Component replacement involves disconnecting the battery, removing and reinstalling the EVAP canister purge solenoid or vent valve, depending on the model year.

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 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.