Originally Posted by Sohere
Friend of me did this on his F800GS and this works perfect! Bought the TT tank myself some months ago, installed it the same way and it works splendid.
You don't need a fuel pump to get the other 2.5 gal ...
THATS what I wanted to hear!!!
So there is enough suction from the main tank to transfer the fuel uphill from the remaining 2.5 gallons of fuel from the TT tank to the stock tank!