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might need a new fuel level sending unit...... or the gauge cluster is bad... there was a recall years back on the gauges.... the sending unit is not terribly expensive but the gauge cluster...good luck
The LS Lincoln Has 2 Fuel Pumps . The One On The Drivers Side Is Called A Transfer Pump , It Pumps Fuel From Drivers Side Of Tank To Passenger Side Both Pumps Have Sending Units On Them The Transfer Pump Sending Unit Was Bad
its your sender unit. the sender unit is attached to your fuel pump it measures the amount of fuel in your tank and sends it to your fuel gauge. on most cars you can get to the fuel pump by looking under the rear seat if you find a plate with bolts around it you can easily access your fuel pump through there.
Most likely the sending unit has gone bad.Removal of the tank is how to change the sending unit in the tank,It may only be available with the fuel pump assembely.To check it,disconnect the fuel pump at the fuel tank.With the key on,the gauge should peg out past full.
I had previously replaced the failing fuel pump on my '98 K2500 when it went out entirely. I was ready to replace my 2000 K3500's fuel gauge as it was acting up. When I started the engine, the gauge would bounce from the middle to way past full then back. It would also jump sporadically while driving on level ground. I checked the electrical connections at the tank and made sure the frame ground strap located nearby was making good contact. Nothing changed until I removed the instrument panel and cleaned the connections on the back. The fuel gauge seems to be operating correctly now. There are videos on YouTube that show how to remove the instrument cluster if in doubt. Mine dash has a pop-in plastic bezel followed by 4 screws to hold the cluster in place. It took about a half hour to inspect & clean the dash connection vs. $250 to replace the pump/sending unit combo. Hope this helps.
I had the same issue with my 99 Silverado, The sending unit and fuel pump had to be replaced. (the fuel pump and sending unit are one piece units) Chevrolet dealers are aware of this issue, but its still not listed as a recall. I received a lifetime warranty w/labor when I had mine replaced. I also had an issue with the instrument cluster in dash that had to be sent out for repair unrelated to fuel gauge (speedometer)...also dropping the fuel cell is how mine was done also.
My guess would be the fuel pump purchased was bad...