Oldsmobile 17089068 Valve Assembly, Fuel Vapor Pressure Control

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The Evaporative Emission Control (EVAP) System reduces evaporated hydrocarbons from entering the atmosphere. The EVAP charcoal canister stores fuel drawn from the tank. The PCM commands the EVAP solenoid to open, purging the canister by drawing fuel into the throttle body. The system includes the purge valve, vent valve, fuel tank, and pressure sensor. Tests are performed to ensure proper functioning. Faulty components, blocked lines, and fuel system leaks can affect performance.

The evaporative emission (EVAP) system prevents hydrocarbon release into the atmosphere by storing fuel vapor from the fuel system. Components include a charcoal canister, two-way check valve, fuel cap, and connecting lines. Vapors from the gas tank are stored in the canister, which vents via a solenoid valve in carbureted or fuel-injected models. On 2001 models with the On-Board Refueling Vapor Recovery (ORVR), the canister is beneath the vehicle near the fuel tank. Inspect the canister for damages and never wash it. Test airflow in both carbureted and fuel-injected models by blowing into ports. For carbureted models, ensure the vent solenoid valve allows air when the engine is off but restricts when on. Fuel-injected models' EVAP canister purge valve should show consistent resistance and proper airflow. Replace faulty components and label hoses during replacements. Installation is the reverse of removal.