Fresh water tank leak - help please!

[Devon Pete]

Hi all, rather strangley my westfalia fresh water tank has spontaneously sprung two leaks this weekend. The first is around the drain tap underneath, so I'm going to try some PTFE tape to improve the seal on the thread. However, the other is a mystery. The sympton is water leaking out from underneath the floor across the other side of the van (i.e. water is travelling across the width of the bus under the floor and dripping out under the sliding door). All very strange (to me anyway).

My initial diagnosis is that it is either one of the hoses or the tank itself. Replacing the hoses looks relatively simple (?) but replacing the tank looks like a bit of a mission! If anyone could give me the benefit of thier wisdom on this, it would be greatly appreciated!

1. How could the fresh water tank spring a leak when it is so well protected and would never come into contact with any abrasive objects or suffer any knocks?
2. If the fresh water tank needs replacing, how is this done?
3. Are the replacement tanks on gunzl a straight swap?
4. Could the leak bsomething else, not the tank itself? Is there a good way to investigate (process of elimination).

Cheers all!

PS could it be one leak, and the water is tracking down the outside drain and dripping from the thread making it look like the thread on the drain is faulty, but actually the leak is further up? ?

[BOXY]

Try putting food colouring in the tank and watch to see where the coloured water comes out.