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Q: my stft1 is reading -2.3 when evap is purging and after the purge has finished 0 on 2007 Volvo C70

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my stft1 is reading -2.3 when evap is purging and remains between 0 and -2.3 after purge has completed! could this be a factor in why re-fuelling my car is a chore? takes about 10 minutes for half tank.
kind regards graham
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