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I have the same problem, it never goes away. I have changed out not only the charcoal canister in the engine bay, the solenoid switch for the EVAP system, and the little canister under the tank, but I have changed the gas cap 3 TIMES. When I did the charcoal canister the old one was clogged with fuel??! The first new one I bought was defective, I returned it to Nissan and they tested it and gave me my money back. Then I was using some old cap, now another new one, same darn problem.
I do not understand how after 30 seconds of running a vacuum can be building up inside the gas tank, unless something is not letting air get sucked INTO the tank. I know a little vac is normal, but this is a LOT.
The only solution I found is to crack the gas cap. But that lets stinky vapors out that somehow get sucked in the drivers open window and that sucks.
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I like my tin can car
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