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Getting codes PO455,461 and 463 can I get to gas tank to check lines from trunk? on 2006 Pontiac G6

I did replace the gas cap before the check engine light came on not sure if gas cap could be faulty after a year which would cause 3 codes to come up. Anyone know how to check or have a diagram of where these vapor lines are? Gas tank reads E.

try www.alldatadiy.com po461 and 463 indicate fuel level sensor issue.does the gas gauge work correctly? did you replace fuel cap with a factory cap or aftermarket? you may have a evap leak at fuel pump o ring and a bad sending unit. i rec you see a mech for further diag
I REPLACED THE CAP WITH AN AFTERMARKET CAP. WILL CHECK OUT THE WEB SITE YOU RECOMMENDED. GAS GAUGE DOESN'T WORK AT ALL I SHOWS THE TANK TO BE EMPTY.
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