GM 12375515 Sensor Asm,Water In Fuel Indicator

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Fuel tank vapor is directed through a check valve into the charcoal canister, where activated charcoal absorbs the vapors. When specific conditions are met (e.g., engine running, preset temperature reached), the ECM/PCM opens both the purge valve and vent valve. This action allows fuel vapors from the canister to be drawn into the intake manifold and combustion chamber, where they are consumed during engine operation. The ECM/PCM controls the vapor flow rate by modulating the EVAP purge valve control solenoid's duty cycle.

The EVAP system is protected by a federally-mandated warranty of 5 years or 50,000 miles. When troubleshooting, start by checking hoses for damage, disconnection, or misrouting, and repair or replace hoses as needed. For early models without electronic purge controls, inspect the charcoal canister, purge control valve, and vacuum hoses for issues.