search for part numbers 31272730, 30756097, 30756097. 730 shows as the fuel pressure sensor for 2003-2010s but your original may be one of the other numbers. Or press the easy button and use FCP or EEurparts to select the Bosch part or use Tasca Parts for Genuine Volvo (best prices I've found)

 

None of those parts show up with my VIN 🙃

 

also attempting to troubleshoot fuel issues on 03 xc90, couldnt find PEM in any of the three locations listed on vida, or any help on internet till this post, Thank you! also attempting to find the answer on pressure sensor, any update on yours? Its not on the fuel rail as listed on manual, nor is it the part sent when ordered based on part numbers.

 

vida says the item above the tire / tank you asked about it is a 'leak diagnostic pump'