You'll need to use either a large flathead screwdriver or a pry bar that you can hit with a hammer to rotate the black ring counterclockwise. A few revolutions and it will come off. You will then need to pry the pump out of the tank. There is a plastic ring inside the tank that will remain. You'll want to pry the pump away from that plastic ring. You'll see what I mean in the picture. As you pull the pump up you'll need to squeeze the two metal supports together to get it to fit out of the top of the tank. Be careful to angle the pump out so you don't damage the float.
There is one rubber ring that is permanently part of the gas tank. Then you have the one that comes with the pump. I cannot understand why you're having the difficulty getting the pump into the tank and seating properly. Maybe you should post a picture of the mouth of your tank and what it looks like when the pump gets hung up on installation.
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