I had a look at that, seemed like a great idea until I tried finding a suitable metal spigot.
I may be able to acquire the lower part of the pump from India, so the next problem is to drain the fuel tank. It is obvious that this problem didn't arise until I had filled the tank, so now I have a full tank, don't want to waste the fuel, have some containers and am a bit stumped. The obvious way is to turn the tank upside down over a large funnel - messy and not very accurate. I love the design of the fuel filler that stops you getting a syphon in there, whilst it means your fuel is harder to steal it does make emptying the tank very difficult.
Any suggestions would be welcome before I waste half the tank!
The more I look into this the more common this appears to be, bit of a design fault methinks.