Contents: Fuel vapor recovery system capacity ↧ Removal the fuel vapor recovery… ↧ Installation of fuel vapor recovery… ↧
The fuel vapor recovery system operates on the principle of using a container filled with activated carbon. Fuel vapors are fed from the fuel tank into a fuel vapor collection container (with activated carbon) during engine shutdown. With the engine running, fuel vapors are forced out of the carbon element by the incoming air stream and into the intake manifold for subsequent combustion in the cylinders. The gasoline vapors flow from the fuel tank line into a tube marked TANK. These vapors are absorbed by the carbon.
The purge of the tank is controlled by the engine control unit (ECM) when the engine is running for a certain period of time. Air is introduced into the tank and mixed with the vapors. The air-fuel mixture then enters the intake manifold.
The ECM closes the power circuit to the EVAP purge solenoid valve. This valve is pulse width modulated (PWM), meaning it turns on and off several times per second. The EVAP canister purge PWM sleep mode varies depending on operating conditions determined by air mass flow, fuel trim, and inlet air temperature.
Poor idle, stalling and poor drivability may occur under the following conditions:
- eVAP Canister Purge Solenoid Valve Malfunction;
- tank damage;
- rupture, cracks in hoses, incorrect connection of tubes.
Fuel vapor recovery system capacity
The Evaporative Emissions (EVAP) Canister is an emission control device that incorporates charcoal pellets. The EVAP Canister is used to store fuel vapor from the fuel tank. When the proper conditions are met, the ECM activates the EVAP Canister Purge Solenoid, which allows the fuel vapor to be directed into the engine cylinders and burned.
Removal the fuel vapor recovery system components
Warning: System components may contain hot vapors. Avoid open flames and do not smoke nearby.
1. Remove the exhaust evaporative canister evaporative hoses.
2. Remove the bolt securing the EVAP canister flange to the vehicle.
3. Remove the EVAP canister.
Installation of fuel vapor recovery system components
1. Place the fuel vapor recovery system container in the runners, install it in place and tighten the flange mounting bolt to 20 Nm.
2. Connect the hoses.
[The original source of the article is the website «chevyman.ru»]