I need to remove the fuel tank on my XJ750. Its half full/half empty depending on your out look in life, but cannot remove it with out losing all my fuel.

It has a prime, on, and reserve. What the best way to take it off? I need to remove it as the bike is running extremely rich, misfiring and generally sounding like the proverbial sack. I need to get the carbs sorted.

Any advice would be greatly appreciated.

i assume you can remove it with the tap in the ON posn, no fuel will come out because it needs the engine running to open the tap (vacuum operated)...just dont try it in PRIME as this bypasses the vacuum operation

Pours out no matter what position i set it too. This could mean a faulty tap, which in turn could cause excess fuel to get to the carbs, causing the rich running and misfiring due to flooding carbs.

I think I'll have to waste a bit of fuel, save what i can and get a new fuel tap or if possible a fuel tap refurb kit.

you could always buy a syphon and some jerry cans....yes the fuel should not free-flow in any position other than prime