My 1990 wagon will run when I use an alligator clip from fuse #4 to #6. I can hear the main pump run and the car will fire up and run. I'm in the process of replacing the in tank pump as it is dead. But I don't think that is the problem, if it runs on the main pump with the jump at the fuse panel. I also read you can pull the Fuel pump relay, and insert a wire made with 2 blade terminals into the socket from Red #30 to the Yellow/Red wire. This also makes the main pump run, but the car won't start in this position. I've bought 2 new $25 Fuel Pump Relays, and wonder if they are a bad batch, as when I open up the relay, I can see cracked solder joints! I reflowed them. I also ordered a new Volvo fuel pump relay for $75 so we'll see... any ideas?