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Well, there is a non-turning impeller in there which can restrict water flow. :smt102

I have never tested, let alone done any pressure or flow measurements, when towing a PWC backwards.

I do...

Funny you bring that up. Actually, I gave that notion considerable thought just before posting... and figured the venturi wouldn't function in reverse flow pattern - aka no progressive restriction to...

Water pressure is water pressure. Towing a ski backwards could (I imagine) pressurize the jet pump exit nozzle area, and that is where the cooling water inlet is located.

I have never tested such...

The bilge siphon system (shown in section "Hull & Deck" of the part fiche diagrams) could be a potential source for water inside the hull given the scenario you described - aka the metal tube you see...