GM 17113330 Canister Asm,Evap Emission

The EVAP system works by letting its charcoal-filled tank take fuel vapors from the tank, then letting the engine pull those vapors into its intake during operation. The EVAP system works when different parts come together: the activated charcoal canister, purge valve, vent valve, pressure sensor, fuel tank, and air release and fuel line connections. The vapor from fuel tank passes through a check valve and vapor tube before going into the charcoal canister, where the activated charcoal holds and traps the vapors. The ECM/PCM makes vapors more available by opening certain valves in certain conditions. The computer control unit controls how vapor passes through by repeatedly switching on the EVAP purge valve solenoid throughout each second according to engine conditions. These newer models use OBD-II technology to test for gas leaks in two ways: by drawing a vacuum on the canister system, and by checking fuel tank pressure to find where liquid is escaping. Just like the MAP sensor, this fuel tank pressure sensor sends a voltage signal to the PCM to help measure the pressure of air inside the tank. The Federal government guarantees the warranty for the evaporative control system, but most problems start from disconnected or damaged hoses that can be easily checked. When there is no electronic purge control like early models had, you need to examine the charcoal canister along with its components for harm or signs it was incorrectly routed. Late models need someone to examine both fuses and the electrical wiring of these two valves, which stay off unless they're turned on by the Engine Control Module. To fix parts that break on the EVAP canister, you need to clean the connection area before taking it apart, and you must follow separate guidelines depending on which year your car was made.

The EVAP system works by letting its charcoal-filled tank take fuel vapors from the tank, then letting the engine pull those vapors into its intake during operation. The EVAP system works when different parts come together: the activated charcoal canister, purge valve, vent valve, pressure sensor, fuel tank, and air release and fuel line connections. The vapor from fuel tank passes through a check valve and vapor tube before going into the charcoal canister, where the activated charcoal holds and traps the vapors. The ECM/PCM makes vapors more available by opening certain valves in certain conditions. The computer control unit controls how vapor passes through by repeatedly switching on the EVAP purge valve solenoid throughout each second according to engine conditions. These newer models use OBD-II technology to test for gas leaks in two ways: by drawing a vacuum on the canister system, and by checking fuel tank pressure to find where liquid is escaping. Just like the MAP sensor, this fuel tank pressure sensor sends a voltage signal to the PCM to help measure the pressure of air inside the tank. The Federal government guarantees the warranty for the evaporative control system, but most problems start from disconnected or damaged hoses that can be easily checked. When there is no electronic purge control like early models had, you need to examine the charcoal canister along with its components for harm or signs it was incorrectly routed. Late models need someone to examine both fuses and the electrical wiring of these two valves, which stay off unless they're turned on by the Engine Control Module. To fix parts that break on the EVAP canister, you need to clean the connection area before taking it apart, and you must follow separate guidelines depending on which year your car was made.

Common symptoms of EVAP faults include strong fuel odors or raw fuel leaks, particularly in hot temperatures.

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.