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
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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