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Fuel tank popping noise

Confirmed popping noise from fuel tank shortly after start up and then again shortly after shut down. It is not in the exhaust system. Is there some type of fuel vent/valve that is either plugged or defective. It acts like the tank is unable to equalize the pressure. As if the fuel when sucked out the tank basically is collapsing in (Popping in noise) Then once the fuel pump stops after shut down the tank pops back out as air must leak back in? I have tried to find a diagram to find if there is such a component, and if so where is it located?

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Does it do it if the cap is off?

Posted on May 02, 2017

Testimonial: "I don't know....didn't try that but the issue went away sometime ago on its own."

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