Chevrolet Impala hard to start after fueling with check engine light code P0496 on Chevrolet Impala

Some Chevrolet Impala owners report experiencing hard starting after fueling, accompanied by the check engine light displaying code P0496. This trouble code indicates an issue with EVAP flow during a non-purge condition, often caused by a faulty EVAP or fuel pressure sensor, an EVAP system hose leak, or a clogged EVAP canister. Symptoms associated with the P0496 code may include an illuminated check engine light, rough engine running, and performance issues. The code suggests incorrect intake vacuum flow in the EVAP system, with higher vacuum levels triggering the warning, which is particularly common in GM vehicles. Additionally, fuel-related problems, such as clogged injectors, can further contribute to hard starting and engine performance challenges. Prompt diagnosis and repair of these issues are essential for resolving the hard starting problem and the P0496 trouble code in a Chevrolet Impala.