Water leak

[WarriorZ]

I can't believe this! Brand new house, first water change using a Python. Fitting were all tight, but the water leaked into the vanity under the sink!!

Using the sink any other time is fine, hook up the Python and I have water leaking below??????????????

Help please

 

[Kagh't]

is it possible that the python is creating back pressure which is opening a hole (or warping an o-ring or something)somewhere in the piping that would otherwise be sealed?
otherwise, just hook it up, and see where the water comes from.

 

[WarriorZ]

Funny you say that. It does leak at the base of the faucet, which I think drips thur below. So it does look like some sort of back pressure. Also that sink now has a slow leak (drip, drip).

What can I do to resolve this?