My gas gauge isn't working right?

2001 ford ranger 3.0 manual 2wd. My gas gauge is fluctuating but it doesn't really correlate to how much gas is in my tank. I'd say that it goes between 1/4 and 5/8 most of the time.

What should i check? How do i check it? Is there anyway i can read the voltage on the sending unit to see if its good? I'm out of ideas

If it's a 2001, the sender is probably bad. Or the float is rusted off or leaking.

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