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Pressure is measured in PSI (pounds per square inch) but with the data given there's no way I know of to calculate anything for you're experiment other than the fact that you did reduce the pressure in the engine compartment.
Maybe if we knew the diameter of the tube, the depth of the liquid and where the end of the tube was in the liquid the bubble threshold could be found but even then all you would know is you were over this pressure first and then under this pressure second, but still no way to know how far.
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