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Easy to check for a pump failure. Crank the car for 10 seconds, then remove the cap on the schrader valve on the end of the fuel rail. Depress the pin on the schrader valve and it fuel sprays out hard, then the pump is just fine.
Replacing the pump is no big deal on the V70. You will need a 10mm ratchet.
Take out the cover over the spare tire. Remove the side floor panels by lifting them up. Remove the 4 10mm screws that hold down the floor that is closest to the rear seats and pull back on the floor to remove it. That exposes 2 aluminum covers, the larger one is the fuel pump.
Remove a bunch of 10mm screws to lift the cover, unplug the fuel pump's electrical connection. Clean out all of the dirt/dust. Using a wide screwdriver or similar implement, pull up on the two fuel lines. Remember which one goes on which nipple, usually one of them has a yellow tape.
I use the handle end of a pair of pliers to twist the large plastic off. This may take some strength and patience, it has been on there for a very long time. I remember using an additional set of pliers to grab the top of the pliers to help turn the plastic bung nut while squeezing the handles and pushing down - lots of torque needed. Once it starts to turn, it becomes very easy. Then lift the fuel pump out and place an old Tshirt over the hole to keep the gas fumes down.
If you buy just a Bosh pump motor, you may need additional (new fuel line) 6 inches worth. The plastic end tip on the return line disolved on my 850 so I just left it off - it is intended to decrease bubbling or noise of fuel running back into the tank.
The old fuel pump will have gasoline in it, I just poured it into a can. You want to work on the pump in a well ventilated place.
I managed to reuse the wiring rather than cut and crimp the supplied wires. It took a while to get the wires out of the plug, but I was happy with the whole process.
It took me over an hour to replace the pump.
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Keeping it running is better than buying new
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