Obviously it might be any of a number of locations around the fuel system but don't discount the rear of the vehicle as the source. I recently had the flexible rubber section between the filler and the tank neck replaced because it had perished, which is apparently not uncommon on XC90's of this age.
Whilst in the later stages of its demise it was clearly apparent where the leak was, through the puddle forming on the garage forecourt during fueling, in hindsight I did recall getting a general whiff of petrol on exiting the vehicle a few times in the weeks preceding failure proper.
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2007 XC90 V8 Sport
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