One thing I forgot- the 25 amp fuse and holder on the driver's inside fender. The red wire from the positive battery post runs to it. Remove the fuse and clean the contacts (assuming the fuse is good). Try to start again.

You say the solder joints look good, but remember appearances can be deceiving. I would still solder it to eliminate that as a possibility.

Try this- Use a jumper wire to connect fuses 4 and 6. With that jumper in place the pumps should run. If they fail to run then I would remove the leads from the pump and attach a test lamp to the leads. Put the jumper from fuse 4 to 6 back in place and see if the test lamp illuminates. Test light illuminates but pump does not run? Pull the back seat up and make sure the fuelpump ground is good. Remove fastner and scrape the area clean to insure a good ground. Still no light when jumpered? Then you MAY indeed have a bad pump. Not positive that indicates a bad pump for sure. Once you have done those things come back and post again adding what you have done and perhaps there will be additional comments.

Randy