1990 70hp ETLD overheating

[Spfshr70]

The problem recently started when I changed the impeller so I am pretty sure it is related to it. I did find out when I changed the impeller out that there were no seals between the pump housing and the water tube. I got the three seals that they recommend but not sure if they are on right and couldn't get any good information on how to install them. When I start the motor up at the house it runs good and pees water, but nothing comes out of the fitting by the t-stat that is used for the water psi gauge at the top of the motor. Any suggestion would be greatly appriciated.

Thanks

[boats.net]

If running on flusher you ptobably wont see water at that plug, it has to be run in water to get enough water up there.

[rodbolt17]

the 60 and 70 two strokes are the only two motors Yamaha specifically says NOT to use a water pressure gauge on.

its a high volume low pressure system.