Unless you have AC ground power hooked up it will not matter which LH pump you put on as they are AC powered through Main Bus 1 and Xfer Bus 1. Some aircraft have a DC pump option to push fuel up the keel beam to the APU.
Personally if I have AC ground power hooked up I turn on all 4 main tank fuel pumps as part of the cockpit setup. If not I start the APU on battery with minimal other electrics on to preserve battery power, very important in our Canadian winters as you usually only get one shot to start the APU on batteries on cold mornings without ground power.