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

 

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jdk9073, Lafayette, IN, February 20, 2013, 20:00
 Rookie

the gas tank looks like its collapsing in on itself.

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  • Answer #1

    bmdouble February 20, 2013, 20:14
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     Master

    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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  • Answer #2

    pushrod February 20, 2013, 21:37
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     Master

    Should have evap trouble codes, is the check engine light on? Vacuum when removing gas cap and does the tank pop back out?

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    jdk9073, February 21, 2013, 14:07
     Rookie

    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.

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  • Medium-star Best Answer
    Greg's Orange Auto (12205 Answers) , Orange, CA - (714) 361-9386
    globalhelper February 21, 2013, 06:35
     Master

    did you just install a new gas cap? or ck #1 suggestion and scan evap codes

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