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CLEAN the junk out of the injector hole before you pull them. LUBE the hole with some WD-40 or a few drops of ATF. The O-rings can bond themselves to the opening but if you wiggle them around a bit, the lube can coat the surfaces that get exposed, then it'll slide right out. If you let WD-40 evaporate before you're done, re-wet the area.
LUBE the bottom O-rings before you jam each injector back in, and LUBE the top O-rings before you try to get the fuel rail on and it will all slide together like the parts were made for your car. Again, WD-40 or ATF works great. Grease stays around and just holds the dirt, so liquid lube is better for servicing.
The seal kits are cheap (about $3-5 at Volvo) so use new O-rings.
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