Quote:
Originally Posted by Alex E
Guys, could it be the MW injection pump itself? Some kind of cavitation?
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Speaking as a mechanical engineer, cavitation is greatly misunderstood. It is liquid vaporizing temporarily due to a low pressure region, such as behind a spinning pump impellor. It quickly condenses back to liquid as the vapor bubbles reach a higher-pressure region (releasing energy in a small point to make noise and even erode metal). Cavitation does not form air bubbles.
There is a related issue where dissolved air can be drawn out of solution by applying a vacuum (or lower pressure region) to the liquid. That can draw air bubbles out of solution. But, there would be no excess dissolved air in the fuel drawn from the fuel tank. If the fuel tank was pressurized to say 1000 psig, it could have appreciable dissolved air, but unless testing liquid rocket engines or working in a chemical plant (me), you wouldn't run into that.