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Take the anti-syphon valve out of the fuel tank, replace it with a regular 90 and give it a try.

Have you pulled the hose off the trans cooler and stuck your fingers in there to feel for old pieces of impeller and or possibly plugged up exhaust elbows.

Small trash can from dollar store bag of cement and a threaded eye with nut and fender washer good lake anchor. Cheap too.

Yes I would have to agree make sure their are no pieces of the impeller blocking anything including the trans cooler. And a hot moter can suck water up as it cools happened to me.

Looks like your boat is much newer than mine 89 but replaceing the breaker solved it for me.