I have a similar problem with the (factory) 23L tank on my CCM. The taps are lower than the float chamber and the engine stops with just under 3L left. I looked semi seriously at fuel pumps but while I was still thinking about what to do with one I came up with a workaround that I'm still using.
The cap is the usual plastic one with a vent pipe that goes down through the head bearings. Normally I'll just refuel before I get to the last 3L but when I do need them I replace the vent pipe with a short bit about 3" long that has a tyre valve fixed in the end. A few strokes with a bicycle pump and the pressure build up in the tank pushes the fuel into the carb.
You don't need much pressure, just enough to move the fuel. Too much pressure and you'll overfill the float chamber (or potentially split the tank but mine's survived substantial pumping). I've only had to do it a few times - usually on a long run when I can't find a garage but it does work.
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