[rheavn]

For those that want to get serious about finding air leaks here are the tools I found most useful.  The big leaks are easier.  The smaller the leak the harder the detection.  Every leak I found was either at a fitting, valve or a leaking component.

Have a soapy solution and a spray bottle.  I like a small bottle as you will be trying to spray in some tight congested areas.  For a solution I use the kids bubble solution

The ultra sonic leak detector is very useful, but don't be fooled into thinking you just wave this around and you will find all your leaks.  I find this tool is useful on finding medium to large leaks and in locating exactly where they are located.  Also good to use in those hard to see areas like under the dashboard.  Many different brands & price ranges.  This is just the one I use.

     

Leakdown tester was the most important tool!  It tells you whether you have a leak or you don't.  Points you in a direction, but doesn't locate the leaks for you.  Allows you to eliminate lines, valves and components as you go.

   

Piece of air tubing with a union.  Used this in tight places to get leakdown tester away from other stuff like tubing, hoses & wiring.

   

Capped off piece of tubing.  Very useful in allowing you to test single components and take them out of the overall air system.  I have two of these.

   

This tool is used to inject compressed air into a line.  In trying to identify where lines go that are impossible to follow, this tool is very useful.

   

All of the tools shown are for 1/4" tubing.  I also have a complete identical set for 3/8" tubing.

For those that want to have some one else find your leaks this is the most important tool.

   

Good luck in your hunt.