The STi has a water spray tank with a level switch and washer type pump. It works very well in priming. Even this small pre-pressure will also increase significantly the flow potential of the piston pump design of the Aquamist pump.
If you are willing to do a tank in this manner I would research some for a large washer resevoir that has a built in pump and level sensor and designed in a way that will keep the intake covered during turns.
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