750 sport tank
 

Need a tank for the wifes 750 sport in the matt black preferably if not any colour can always get it painted, hers has concaved don't know how, has anyone else had this happen.

Ooh nasty.There was a similar thread on this subject a while ago.I seem to remember the cause was most likely to be a blocked tank breather.
Basically the fuel pump is trying to suck the petrol and tank into the engine!:o