Fuel gauge stuck on full for my 2000 ford taurus SE

Question edited for clarity.
Question moved to model category.

Diagrams in this link and image below

https://www.google.com/search?q=2000+Ford+Taurus+SE+3.0+firing+order

The PCM - engine computer will energize the fuel pump relay for two seconds with the key , When cranking the engine the PCM will only energize the fuel pump relay if a crankshaft position input is seen . An testing fuel pump pressure should be done with a fuel pump pressure gauge only .

Remove the fuel tank and replace the fuel level sending unit is what will be needed is my guess.

Fuel pump is located in the fuel tank. Follow the link. It is not a job for a faint of heart, especially if you have a full tank of gas. How To Replace Fuel Pump 1999 Ford Taurus EricTheCarGuy

I was having this problem and it was a bad fuel pump. Later on started having trouble with this again and mechanic discovered the fuel pump wires had been damaged and was grounding out underneath fuel tank.

Torqu converter clutch seems bad, drive uphill with 1 foot on gas & tap brakes at same time, if engine revs up, this is the problem

The fuel pump is located in the fuel Tank.
The tank has to be lowered down and the pump removed
Hope this helps
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urnuts73 @ FixYa

You will need to locate the wire to the fuel sending unit at the fuel tank.

Once you locate the wire, disconnect it and see if the guage goes to 'E". If the guage goes to "E", you probably have a bad sending unit.

To double check, ground the same wire to clean metal on the frame with the key in the "on" position (not running). If the guage does not move, the guage is bad. If the guage moves from E to F, the sending unit needs to be replaced.

your float is stuck on the fuel pump

check the fuel pump itself.. if no fuel going through lines... injectors won't work.