I find the fuel range on my Fuoco is just not quite big enough for the distances I ride so have been looking at the easiest and simplest way to increase its fuel capacity. After a lot of thought about increasing the capacity of the existing tank I think the easiest way is to make up an extra fuel tank that can just dump into the existing tank when it is getting near empty. I have looked at a lot of options but there arent too many easy places to mount one. My current thinking is to mount a horseshoe shaped one around the base of my topbox (this is a box similar to the Givi 56 litre box). Either use 4" aluminum or stainless tubing or just make up a horseshoe shape from two 90 deg 4" truck exhaust pipe bends, mounting them with clamps off the existing Fuoco grab rails so the tank goes around the base of my topbox but high enough so it doesnt intefere with the existing tail lights. I calculate this will hold around 10 litres. This will have an on/off drain tap on it. Under the bike at the rear and bottom of the existing fuel tank there is an extension that has been designed (but not fitted) for a drain. It will take a hose and clamp, just drill a hole in the existing tank and clamp a hose over it. It does not have to be that big, so will probably reduce down to about 3/8" hose and then run it up to my on/off tap on the auxiliary tank. The idea is that when my original 14 litre tank is nearly empty I can then open the tap mounted under my auxilary tank and the 10 litres from my auxilary tank will then run down into the main tank.
The other option I have considered is to relocate the existing taillights higher and make up a tank assemply where they are currently located. It would still be high enough to run into the existing tank. Around 10 litres is the ideal size, as all I am looking to do is to run the existing 14 litre tank down low enough so I can just gravity dump around 10 litres into it.
Any comments/suggestions/better ideas?