:welcome:
Yes you will need to at least partially drain the tank.
The outlet is slightly forward of the middle of the tank
So you can pull the line off a the fuel pump then back down under the mower.
From there it will drain by gravity.
This will be easier if you pull the deck off first.
It is a strait swap job the other end just has clip on it same as the carb end.
I usually split the very end of the tube and peel it back so there is no strain on the spiggot on the tank.