No idea, but I'd be really keen to have a full instruction set from you for when I need to do the same! 
I need to connect a feed line into the top of the deisel tank for a supply to my deisel hob and heater.The top of the tank has a large plastic collar that must unscrew but i am not sure which way to turn it any ideas as i do not want to force it and it will not turn by hand i will need to make some kind of tool.:frown: