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Discussion Starter #1
So I have a 2018 Traverse LT FW with 36700 miles on it. Last week my check engine light came one. So I have a OBD reader on my sprint drive, and it alerted me that my P code was P0469 bad purge valve. So I change the purge valve, then this morning the check light came back on. Now its P0455 EVAP system leak detected (large leak). So there is no gas cap, so that went out the window. The only other choice I could think of is a bad vent valve. Any one have any suggestions, or have a clue where the **** the vent valve is located. I crawled under the vehicle and couldn't locate it, unless its on top of the gas tank.
 

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I do, but when the light came back on I was just below a half tank.
should never overfill gas tank this will damage the evap system overtime alway stop when the pump stops automatically.
you probably damaged the evap system.
 
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