[cmrnpizzo14]

The easiest way is to prevent leaks in the first place.

If you are using the plastic storage tanks, don't tighten the fittings too much, leave a thread or two visible. It is very easy to crack them.

Cut all of your tubing square on the end so that it fits in nice and snugly.

Make sure all of your tubing is fully plugged in.

Be liberal with teflon tape but don't overdue it. 2 or 3 wraps around the threading should be fine. Be careful that you are wrapping it the correct way as well. Counterclockwise I believe (someone correct me right away if I'm wrong).

Make sure that all of your components are nice and tight. Use a wrench, don't just hand tighten.

If you do have leaks, apply soap water to your pneumatics and look for the bubbles. That should show the problem region and then just check everything in that area for the above mentioned problems. Good luck!