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.

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1 answer 1 comment
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.