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

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

Asked by for the 2007 Volvo C70
While it's in purge mode it is drawing on the fuel system, and that is why it shows rich.