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Thank you so much for your answer and being interested in my problem.

This is definitly the parking heater fuel pump which is installed in my V50 D5244t8 equipped with Eberspächer D5WS.
The heater itself has been recently rebuilt and it is like brand new. It works perfectly on the bench and it was working perfectly when mounted in the car last winter, but this winter it stopped working again, and VIDA found a problem with the heater fuel pump or the fuel filter. I fitted a brand new, clean fuel filter I decided to buy and install a brand new oryginal Eberspacher fuel pump.
I know for sure that it's NOT anywhere around the haeater itself couse I was disassembling it last year on my own, so it must be hidden somewhere arount the fuel tank or rear axle. I won't believe it's inside of the fuel tank. Do I really need to lower the tank or disassembly rear suspension just to cange that little pump?
BUT WHERE IS IT FOR SURE? NO ONE KNOWS. (SO FAR)

Photos in the attachement.

Sorry for my imperfect English. English language - difficult language