...as an alternative to the options already detailed for example here on ukGSer: 1200GS Fuel Pump Bypass Cable
The latest generation workaround - just remove failed fuel pump controller and connect between the connector plugs on the bike, much better than having a long flylead to the battery or splicing wires into the bike's wiring and easily carried under your seat. The black connector is the original from the fuel pump controller! :aidan
Full details and instructions on dismantling a failed Fuel Pump Controller to remove the black FPC connector and making the bypass lead can be found here (blow by blow instructions with lots of photos):
BMW R1200 R1200GS Fuel Pump Controller Bypass