Huzzah! After 3 rounds of WD40 soaks over 12 hours, and 30 minutes of taps with a hammer and punch I have a clean shaft ready for a new brass key and prop. 

Thanks to the crew - doing some outward facing taps on the key were key. I cleaned it up a bit after removal and confirmed steel.

New key comes in a few days and I should be set. I was worried about the shaft strut, bushing and drive shaft but I have very little play in the shaft and had no vibration underway so I should be clear with just a new prop and a minor repair on the old. 

I am running a acme 3407 15.5" x13 prop, same prop I ran on my 2020 T22 heavily weighted and had no issues.  My new T220 I am actually running  less weight, and the issue happens with no weight in boat also. 

Hi, just join them together so there is a contant flow loop or cap them individually?

Thanks

Trace the heater hoses back to the motor and hook them together - or unhook them from the heater core and hook them together there - leak is likely the core, not the hoses.

Having same issue. After running  for a little bit, the gas gauge shows zero the depth gauge shows zero the wedge stops working and the surf gate stops working. Did anyone find out the issue of why this happens?