I've never done one on a 90, but I'm pretty sure it's the same as on a 110. Once you undo the locking ring, you can withdraw the sender part way, but, then you have to rotate it because of the bends in the sender float rod. There isn't anything for it to hang up on, so you're probabaly not rotating it while withdrawing it.
I guess it goes without saying but you want to do this when you have less than a half tank.
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