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Either the fuel tank sender in the tank is bad and needs replacement, or the fuel gauge is faulty. I would bet the one in the tank is probably bad, because that's usually the case. Find the connection at the fuel tank, disconnect it and use a VOM to get a resistance reading while the tank is empty and reading 1/2. It should match the specs.
To test the gauge,unplug the connector at the tank,the fuel gauge will go to full,then ground the wire to the fuel gauge,and the gauge should go to empty,I use a test light for grounding the circuit,to keep from grounding the wrong connector,when doing so,the test light will glow dim,and the gauge will go to empty slow.
Well that tells me that someone installed the wrong fuel level sensor. Your going to have to drop the tank and pull the pump and float assymbly out. Then go to a parts store and get a sending unit that has the opposite resistance of that sending unit. Just wait until the tank is empty so its a lot lighter. You can call the parts store or go down and see if there is multiple sending units. The sending units work by resistance, when the tank is full the float moves up and turns a wheel in the sending unit, which either removes or increases the resistance causing the gauge to lower. The sending units either give full resistance at full or no resistance at full and then changes as the level goes down until it does the opposite at empty.
check the grounds on your fuel tank sending unit,must drop the tank to do this. with the tank down,remove the ground and look at your fuel gauge it should read full or empty,if it does not it may be a sending unit
Maybe you are actually running out of fuel ,gas gauge is showing 1/4 of a tank when it is really almost empty . Would not have anything to do with the fuel filter , if it did it would happen when full also .
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