Try slackening off fuel filler cap and see if you get a big whoosh of air in or out which would indicate problem with breather system.
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2008 XC70 3.2 SE Lux with LPG conversion - current
2005 XC70 D5 SE Lux - sold
2004 XC70 D5 SE Lux - written off by another XC70
2001 V70 D5 - sold
2000 V70 Classic 2.4 - sold
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