Now cut open the blue (positive) wire to the fuel pump connector and attach push-on tab connectors to both open ends (you are still soldering everything, right?). The part of the blue wire coming from the harness (original +12V supply wire) will now be used to charge the relay (connected to terminal 86). The part of the blue wire which goes to the fuel pump connector will attach to terminal 30/51 - the other main relay contact.

Connect the push-on tabs to the 30A relay terminals as follows: Main f.p. wire (from battery) to 87 (contact).
Blue wire from white f.p. connector to 30/51 (contact).
Blue wire from harness to 86 (coil positive).
Red (or whatever color you used) wire to 85 (coil ground).

It is recommended that you solder the connectors to the relay terminals to be sure the connections will not come loose or develop contact resistance. (You could avoid using the push-on tab connectors and solder the wires directly to the relay terminals, but this is not recommended. It is much easier to crimp the connectors on the wire ends and solder them first, as opposed to trying to solder 10 gauge wire to flat terminals in the back seat.)

Tape everything well, of course.

Connect a ring terminal to the ground wire and solder.

Connect the ground wire to the new grounding point.

Reconnect fuel pump.

Replace cover plate and rear seat.