Adding to the above, a float needle can get stuck for other reasons too. I've had them wear a dent in the finger that pushes on them, and carefully filing away the dent cures the problem. If you take the bowl(s) off and look carefully, the cause of the problem may become obvious. Luckily you don't have to do a major disassembly to get to that part.
And as said above, it takes only a little, hardly noticeable ring worn in a needle to make it misbehave.
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