There won't be any bubbles because it will be under vacuum, not pressure.Apparently (I've not tried it myself), spray soapy water onto the tubing - you can see bubbles if there is a leak.
What about on the inside?There won't be any bubbles because it will be under vacuum, not pressure.
RAB
Also works with brake & clutch cleanerI’ve seen this done with carb cleaner as well. The engine picks up when the fuel air mix is enriched.
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