Gas tank...when I fill up...alot of vacuum is heard thru the filler neck. The plastic tank is collapsing.

1997 CHEVROLET VENTURE
200,000 MILES
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AUTOREP
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What would be the problem? The gas cap seems to be OK. How much vacuum should be on the tank (running) and (parked overnight) The bottom of tank is concave off the saddles.
HK
Apr 25, 2012 at 1:13 AM
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