Need to replace fuel pump relay under dash - 1993 Volvo 850

Yes, you need to remove tank.
There is a fuel pump test connector, either a single wire connector in engine compartment, left side, OR terminal G of the ALCL, the diagnostic test connector under the dash. Put battery voltage there and see if pump works.
Diagram also shows a fuse for the pump, probably in the dash's fusebox.The relay is probably is there also.

I'd check for a fuse to the pump relay.

There should be a fuse relay box under the hood with a fuel pump relay in it...have someone turn the key while you touch the relay to see if it is clicking when you turn the key..if not replace relay....if it does click, then it may be possible that the contacts on the relay are defective and the relay will need replacement anyway...there may also be a fuse for the fuel pump either in this box of under the dash...check to see that it is good also.

The fuel pump relay is located in a fuse center on the driver side fender well right in front of the power brake booster.

LOOK UNDER THE HOOD.THE POWER DISTRIBUTION BOX WILL BE ON THE INNER FENDER WELL.IT HAS FUSES AND RELAYS.BY THE RELAY CIRCUIT ALWAYS HOT.ITS REMAINING CLOSE TO KEEP FUEL PUMP RUNNING.REPLACE IT.BUT YOU NEED YOUR GLOVE COMPARTMENT MANUAL TO LOCATE IT YOU HAVE SEVERAL RELAYS.

Have you checked for power at the fuel pump and the fuel filter.

fuel cut relay in drivers dash fuse box. it is located on back side of fuse box,remove and jump (at fuse box )terminal 1 and 2 where relay was removed from.you should then have power to fuel pump.if so repLACE RELAY

hi tony, i had that same problem come through my shop! i eventualy (hours) found the burnt wire in its clear plastic connector in trunk, above backseat headrest. (top and back of trunk). i hope this helps, so you dont have to do what i did...LOL good luck, marty

You need to replace the PGMFI relay up under the drivers side dash. It is sometimes called the main relay or the fuel injection relay. It is 1"x1"x2" and will have "mitsuba" written on the side. If you get it out, I can tell you how to fix it for free if you know how to solder, or you can by a new one at any auto parts store for about 50 bucks.

fuel pump relay is under dash next to the steering column