Buick 17089068 Valve Assembly, Fuel Vapor Pressure Control

You can Select Your Vehicle to check if 17089068 fits your vehicle.

The Evaporative Emission Control (EVAP) System is designed to reduce evaporated hydrocarbons (fuel) from entering the atmosphere. The most important component of this system is the EVAP charcoal canister, which stores the evaporated fuel drawn from the fuel tank. When certain conditions are met, the PCM commands the EVAP solenoid to open, allowing engine vacuum to purge the canister by drawing the stored fuel into the throttle body. This fuel is then burned in the combustion process. The EVAP system also includes the EVAP canister purge valve, EVAP canister vent valve, fuel tank, and fuel tank pressure sensor, all of which play a role in regulating and monitoring the system. Various tests are performed by the PCM to ensure the proper functioning of the EVAP system, and component testing can be done to diagnose any issues. Faulty components, damaged or blocked lines, and leaks in the fuel system can all affect the performance of the EVAP system.

The evaporative emission (EVAP) control system is designed to prevent hydrocarbons from being released into the atmosphere by trapping and storing fuel vapor from the fuel tank, carburetor, or fuel injection system. The system includes a charcoal-filled canister, a two-way check valve (for fuel-injected models), the fuel tank filler cap, and the lines between the fuel tank and the rest of the system. Vapor trapped in the gas tank is vented through a line in the top of the tank and routed to a carbon canister located in the engine compartment (for non-ORVR vehicles) or under the vehicle (for ORVR vehicles) where it is stored until the engine is started. The canister outlet is connected to an electrically actuated vent solenoid valve in the carburetor (for carbureted models) or operates continually (for fuel-injected models). On 2001 models equipped with the On-Board Refueling Vapor Recovery (ORVR) system, the charcoal canister is located under the right side of the vehicle, just ahead of the fuel tank. The charcoal canister should be checked for loose, missing, cracked, or broken fittings, as well as cracks or other damage. The canister should not be washed. On carbureted models, the canister should be tested by blowing air into the ports and checking for proper air flow. On fuel-injected models, the canister should be tested by blowing air into the ports and checking for proper air flow. The vent solenoid valve on carbureted models should be checked by blowing air into the hose and ensuring that the air flows freely through the valve when the engine is off and does not pass through the valve when the engine is running. If the vent solenoid valve does not operate as described, it may be defective or there may be a problem with the electrical circuit or ECM. The EVAP canister purge valve on fuel-injected models should be located between the charcoal canister and the intake manifold. The electrical connector should be unplugged and the resistance between the terminals should be measured. The purge valve should also be tested by blowing air into the pipes and checking for proper air flow. If the canister purge valve does not operate as described, it should be replaced. When replacing components, the hoses and fittings should be labeled, and the component should be detached and removed. Installation is the reverse of removal.