I finally have my bike back together after 4 weeks off the road, I knew the tank drain was blocked so when I had the tank of, I cleaned out the fitting at the back but it did not fix the situation, I have seen another post where the person had snapped the fitting off in the tank as it is aluminum, so I thought I would leave it alone, today I removed the filler and surround and cleaned out the mess underneath, I remembered I had a roll of bicycle gear shift inner cable I use on my modified cars, It went around the fitting at the top and a few turns resulted in a cleared line with all the contents spilling onto the top of the gear box, if you hold your mouth right and turn the cable in the anti-clock wise direction you can get it to exit the fitting, I did all of this with the tank mounted to the bike, all I did was remove the drain from the tank using a pair of long nose pliers, I checked the other side and all was clear, I dismantled the anti leak valve in the cap and checked that it was clean, reassembled and all is fixed.