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To find leaks like this I have used a piece of plastic tubing with one end held near, but not in my ear and the other end moved around the area of the suspected leak. When you find the leak this way, it's very obvious. Listening through the tubing will isolate the noise to the point where the end of the tubing is. As you cross over the leaking point the sound will suddenly get very loud through the tubing. Again, don't put the tubing into your ear, just near it.

For larger vacuum leaks, a can of test smoke that is used for testing fire alarm smoke detectors works well. Spray it near the suspected leak and watch as the smoke is pulled into the leak. Here is a possible source for this canned smoke. Amazon sells it as well.

https://www.grainger.com/product/36...74728&ef_id=WOuEcwAABCeDvUv1:20170613122352:s

Charley
 
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