My 300zx has alot of air when i open my gas tank to put gas what should i do? i bought it from a guy i guess who did not take good care of it, it seems like vopor lock but fuel injected cars cant get that. what could it be? someone said the vapor canister could be full of fuel. what should i do?

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This is normal in this year, the tank is pressurized to about 5 PSI to control fuel vapor emissions
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