I just got an S80 and havent gotten my manual for it yet. Went to start it today and I got no fuel pressure. Fuel pump doenst even turn on. Can you acces the fuel pump through the trunk? Anyone know where the fuel pump relay is? I get a high pitch electronic whine from the front of car during the time the fuel pump should turn on.?.

 

You have to remove the R/R seat back to gain access to the fuel pump.
But the wiring you can test is under the rear seat on the left side. There is a Grey plug with I believe 4 wires. I forget which one is the feed but if one lights for about 3-5 seconds then stops it is the wire.