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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  • 1 POST
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 24, 2012 at 6:13 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
first, i would replace the gas cap. i would also have the vent valve checked as it may be bad as well.

Roy
Apr 24, 2012 at 6:16 PM
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