After your advice I have got a plastic tank as it should stop any problems in the future. I just need to get the fuel pump assembly (+ remove the regulator) and I was wondering if you happen to know if the Monster 2004+ with the plastic tank uses the same as the ST2 as the sizes look the same (an example below): http://www.ebay.co.uk/itm/DUCATI-oem...item3ce18331b9
I know the ST2 size is about 120mm (diameter), I just have not got home to check the size of the plastic tank yet... If it is then I think i am lucky... though i know it might not be as simple as what i think..
I got some info from here... http://www.ukmonster.co.uk/monster/s...80&postcount=2
This also makes me think that the fuel pump will work... http://pnwriders.com/motorcycle-talk...ml#post3054925