My 1992 chevy 1500 fuel gauge always reads well above full even with only a gallon of gas how can i fix this

Question edited for clarity.
Question moved to model category.

You need a new fuel level sending unit. It is in the fuel tank.

https://www.google.com/search?q=1993+chevy+1500+fuel+sending+unit

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Your fuel gauge sending unit is inside your gas tank.
It is likely defective, and may need replacement.
Some Mazda dealers may have an electronic tester that will measure it's effectiveness.
Having had several cars with this same problem, I have always opted to live with it, but very likely a new sending unit is in order.
God bless your efforts.

How do you know it is still half full? Sure nobody stole your fuel? or never had a leak. Before saying the gauge is off, try to put in a few gallon, and see it the gauge does a reading. Then try to start again. I learned to trust my measurement tools, unless I could prove they were wrong.

watch your fuel gauge they don't always read true they work on ohms if bottom of rod is worn the float isn't making good contact

Usually the sending unit is not connected, the sending unit is stuck on full, or the gauge on the dash is faulty. You would unplug the harness at the tank and check the circuit for power from the gauge.

replace front fuel pump because gauge is made into fuel pump and not serviceable. Or poor boy way of getting by would be fill front tank with gas reset mileage drive normal for a day. refill again with gas note gallons used and mileage driven for average miles per gallon. front tank should be around 17 gallons multiply by mile per gallon you figured

First you will need to test your information display located above the rear view mirror. The easiest way to see if it is accurate is the next time you need gas, fill the tank up! Your car holds 17 gallons of fuel, the display should read 17 gallons after a fill up. If it displays anything other than the 17 gallon amount, then your fuel level sensor is bad. If it appears to be consistent with the 17 gallon reading, keep your eye on it for several miles and after a couple of times that you restart your vehicle to be sure that it is in fact reading correctly. If you are convinced that information is consistent with the actual data, then it's much worse......It needs a new fuel pump! Good luck!

make sure you fuel tank float isn't becoming saturated with gasoline. If the gauge reads full when it is indeed full, you probably don't have a short in the wire that goes to your fuel float sending unit. If that wire is bare and shorts out it will say you tank is empty since it works on resistance open or unplugged the gauge would read full, closed is or going to ground the gauge will read empty. I would think the float might be bad or the float arm got stuck down when you turned a sharp corner. I had one of these cars but I don't remember exactly where the fuel level sending unit is located and if you need to remove the fuel tank to gain access to the sending unit. I hope this helps you

new sender unit required

first try pounding with you fist or a board on the bottom of your tank real hard and see if the readings are different...if they are its a sender.