Gas Needle Marker doesn't work
Could be the float/sensor in the fuel tank to the wiring to and from the tank to the gauge or the gauge itself.
Tom's right on. Most of the time, the fuel sending unit is at fault. Unfortunately you usually have to drop the fuel tank to get at it. Sometimes if you tap the fuel tank with a wooden dowel or something else that won't harm the tank you may get lucky and "unfreeze the float" , but more often than not you will have to replace the sending unit. Hope this helps.
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