There has been a thread about this before... I can't speak on the S14 issue cuz they use a different sending unit than the S13. But I do know that the S13 tank has a metal baffle that likes to comes loose, when it does it usually gets stuck under the float arm on the sending unit and causes it to stick or stay in one position. Sometimes it will break the sending unit and in my case it shorted out my fuel pump.
Pop the cover open and take a look inside, should take you about 15 mins.
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