Don't know the answser, but have a suggestion. With tank partly full, say 1/2 tank plus, turn off car and open gas cap. Close up again without adding fuel and see if it acts the same (hard starting) as when refilling from a low point. If so, that would seem point to something in the evap/vacuum system since teh only thing you have changed is to open the fuel system to equalize pressure.
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Mike Sullivan ('95 855T (88k), '98 V70XC (92k), '95 855 NA (135k). Past Volvo's: '85 744 (256k), '86 245 (165k), '86 245 (195k), '88 745 (208k), '91 745 (196k), '93 965 (147k) .
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