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Q:

where is the plungeer vent clyonoide located? on 2008 Chevrolet Cobalt

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
code 455 and 496. I have changed the gas cap.
(1) Answer
for p0455, you can try this:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary