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the fuel level sender is inside the fuel tank, part of the fuel pump assembly. did you or was the tank replaced before??they may have bent the float arm on reassembly . you can buy the sender from your parts supply store .you will have to drop the tank to do this it clips onto the side of the pump assembly. run it almost dry first as the tank is big n very heavy even 1/4 full. you can try to bend the old arm
but its very hard on the "sender" as for level indicator full to empty, think of the shape of the tank narrow at top to widest point in the middle (full to half) wide middle to narrow bottom( half to empty)
You probably have a ground wire not making contact to ground on the front tank sending unit. OR the sending unit itself inside the tank is faulty. Either way, when a gas guage goes to full all the time (empty or full), this indicates that NO ground is available for the sending unit.
There is a fuel gauge sensor in your fuel tank. If the sensor is out of place, it will not read the amount of gas in your tank correctly if it is out of place. This is a fixable job, but I recommend a ceritfied mechanic. Hope this helps! Please give 4 thumbs up!
This isn't a definite fix, but it may be that the gasoline in your tank is 'sloshing' forwards and backwards and your sensour is getting readings when the gasoline is in different positions in your tank. The connection is actually above your gasoline tank and you'll have to take off the tank harnesses and drop the tank if you want to check to see if the connection became slightly loose, otherwise you can just fill your gas tank and reset your temporary milage gage (that's the little black button near your RPM meter) and remember how many miles you get per tank.