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Try this before you take it apart......
The little black knob at the top of the air line is an adjusting screw. This could be the reason for your lack of bubbles. Try turning the screw to the open position. It's possible that your screw is turned down tight and therefore not letting in the air.
If this fails to make a difference then go ahead and look further and clean it up some.
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Current tank info: Last time I saw them they were leaning against a tree in my ex's backyard.
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