Kike90, how ya been doing. I sure would go after the fuel pump relay once you find out where it is and which one it is. Cannot help you with the location because I wouldn't know unless it was a 740 or 940. There are many other reasons the car can stall beside the fuel pump. Another common cause is the crank position sensor. You may want to try a search on this board using “stalling” to get some more (economical) ideas before reaching deep in your pockets for a fuel pump.

If you can it's always good to do this with a tank that's not more than 3/4 full. By the way ..... no smoking either!!!

Don't do in your grarage at home. You do not want to burn your car and house up!!! Do not use regular light bulbs (drop light) around gasoline. Disconnect battery before removing fuel pump. No open flames or sparks.

To get to the fuel pump, you look under the access front access panel for the spare tire and take out the gray liner over the spare tire. On the passenger side right behind the rear seat you will see a 6" round cover with a handful of 10mm nuts on it. Take the nuts off and gently pry the cover up. If you look at the following picture: This is a picture I found in the forum of Oliver's Fuel Pump. Thanks

http://OBrown2.photosite.com/volvo/

This is what you will see. There are 2 fuel lines. One is marked with yellow tape and the other is plain. Make note of which one comes off from which port. I think the yellow one is the fuel return line.

At this point be VERY VERY careful. Gasoline vapors!!!

The fuel line connectors are quick disconnect fittings. To undo them, you gently pull up on the bottem of the connector and it will compress. This disengages the fitting and then you can pull upward to remove the fitting from the port. The wire from the fuel pump lead over toward the wheel well and there is a connector you can undo. After both fuel lines and the wires are disconnected, you can use a large screwdriver to gently but firmly remove the large "nut" that holds the fuel pump in the tank. After you remove the nut you can gently pull and twist the fuel pump and it will start sliding out. At the bottom of the fuel pump is a screen that is a little larger than the hole in the fuel tank so be careful that you do not damage it on the way out.

Everything goes back together the way it came apart. Hope this helps.

Yes it can...but I would have an independent mechanic do the install unless you've had a lot of mechanical experience yourself. Funny thing you post this because the post right above you is in regards to a faulty fuel pump gasket on an 850. I'd get with that guy and he could tell you what to look for. He has gone as far as taking hoses off of the fuel pump.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon