The lines in your system may need to be trimmed back due to compression leaks if you've messed with them.
They should not leak for a long time, but could be due to fitting seating issues, or if you've messed with them a bunch of times
Re-seat all your lines and all should be good - remove a line from a fitting and trim the end off - then reseat the line by pushing it fully into the fitting
It's always a good idea to use some kind of lube and make sure the ends of the tubes are not sharp so they don't damage the o-rings inside the fittings
So, If you have enough slack in your lines, remove them from the fittings and trim them back a tiny bit. When you do so, make sure they have no sharp edges before you re-insert them into the fittings
I use locks to keep my lines from backing out
