The question has come up about replacing the fuel pump relay on the 850s. There are many reasons you might want to do this. If your fuel pump is cutting out, or if you are having a hard time starting the car. Age is another thing to consider. My car is a 1995 and I just put a new fuel pump, level sender, fuel pressure regulator, and now the relay. I did this mainly for piece of mind.. The fuel pump relay is red and numbered 103. The Volvo part number for the relay is 9434225. To gain access to the 103 relay, you have to take the top cover off of the fuse box that is in the engine compartment. Remove the four 25 torx screws, see the green arrows. Once the torx screws are out just lift the lid and you will see the relay.