engine water pump failed to seal?

I attempted diy engine pump. I followed instructions of sr member Tombukt2. He set me up with a repair that seemed straightforward and i found a place to work on it at a friend. Tombukt2 advised take the pump off without draining any fluid this was the correct method if fluid is still good as you loose the min about a quart as promised.

I bought a aisin pump it was marked to me as 20$ cheaper and still oem. It came with a new metal gasket. I torqued bolts to (8lb-ft, 96 in-lb). The repair was tight and messy but otherwise I got it done. When I went to burp it i hear the coolant hit the pavement as the pump didn't seal. Hopefully someone knows how to remedy this?

Also, I am concerned that the coolant needs changed. What came out of there was orange and murky. The previous owner told me dont worry about engine coolant as he had changed the thermostat the same yr i bought the car and had changed fluid.

Any help remedy these problems is appreciated.

 

I am going to add an update. From my personal research AI thinks this is a gasket issue and somewhat common on prius. It said that this is a case where one doesn't want to go oem because after market is more forgiving on old cars. AI recommended FEL-PRO. i will say i was having problems seeing what i was doing so i did bend the gasket a little when i was setting it up. Its a pain the metal gasket is this sensitive, if the culprit. How would you guess go about it if you agree this is a gasket issue?

 

also i am going to do a proper inspection on the fluid as i feel like this might be the most important part.