GAS GAGE WANT STOP READING EMPTY WHEN GAS IS IN IT

If your talking about fuel gage on the dash, could be one of several issues. Your gas tank is empty? Problem with sending unit in gas tank? Problem with wiring circuit? Problem with instrument cluster?
I don't know your year--make--model?

gauge in-tank probably your problems. You can test it at connector near fuel tank . there is 2 kind of gauge one is 0 to 90 ohms or 0 to 250 ohms. if the reading is not good then gauge is defect
hope it helps

Sounds like you didn't hook up the sender wires, or for whatever reason, the float in the gas tank is sticking.

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One of two things: either the gage itself is malfuntioning or the float/sending unit in the gas tank is failing. Disconnect the plug at the tank for the sending unit, pick up a new sending unit and attach it to the plug without taking the old unit out of the tank. Then operate the float up and down on the new sending unit. If the gas gage reads correctly when the float is all the way up (full) and all the way down (empty) the old sending unit is probably bad and should be replaced. If there is no difference when you connect the new sending unit, the gage is probably bad. Then you can return the new sending unit (as long as the auto parts store allows returns of electrical parts) and buy a new gage. Install the new gage and...happy motoring.

the gas gage sending unit inside the gas tank is defective, that is the only thing that causes this type of erattic reading from the gage.

You have a bad fuel level sensor.The fuel tank needs to come out and the sensor replaced.You don`t have to replace the pump assembly.You can get the level sensor separate.I`m not sure if the parts stores have it but I know the dealerships do.Hope this helps.Good luck.

p0463 is a self diagnostic code that is for the fuel gage sending unit located inside the fuel tank if your fuel gage is reading empty just after you filled it then that verify's the code is correct you have a bad sending unit

check your fuel pump wireing

Yes it is all one unit, and yes that is what the problem is. don't use aftermarket parts, use OEM, (Delco Remy) they are much better quality.

Assuming you don't have some kind of Space Shuttle technology to work with, the best thing to start with is an empty gas tank. When you install the sending unit the little float will be hanging down and the gauge should read empty. You can do some minor adjustments to the float while you are monkeying around with it so that, for example, "Empty" is not empty. This way even if the gauge is reading empty you will know that you have a few gallons left in there as a back up reserve so even if you are reading in the reserve range that you know you will still have a couple gallons left in the tank when you hit the big "E".