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Try unhooking your battery for 30 seconds and reconnecting it. These have what is called a "slosh mode" and if the key is left on during fueling sometimes it will enter that mode and the gauge will stay at empty.
If that isnt it then I would suspect a bad fuel level sender. If you can get to the fuel pump wiring I can help you test that but I would start with unhooking the battery. Many times that is the fix.
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