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Q: what is causing the bottom of the gas tank to suck inward? on 1997 Oldsmobile Bravada

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the gas tank looks like its collapsing in on itself.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Should have evap trouble codes, is the check engine light on? Vacuum when removing gas cap and does the tank pop back out?
its not giving a code, I replace the gas cap awhile ago. I replace the gas tank since the bottom had collapse {it was like half a tank} but the problem has came back, the bottom of the tank has sucked up about 1/2" and will not pop back. I had a friend put his computer on it and where it says evap cycle it just says NO.
I have seen both vent valve failures and canisters saturated cause the same thing.The purge valve pulls a vacuum on the tank at a predetermined time and after it's done the vent valve will release the vacuum from the tank,yours is not releasing this vacuum.
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