On Fri, 2 Oct 2015 16:10:56 +0630, John Smith wrote:

There is no need to use dye to check for leaking. Two minutes after the
water tank is full and water is cut off (no hissing sound) water starts
to slowly fill again. This is definite a sign of leaking.

It may just need a little finessing -- it may be a little offset in
one direction of the other. Try rotating it one direction or the other
until it stops leaking. BTDT