Gas gauge not working correctly

Okay people, there is a trap door in the trunk area, you can pop the back of the backseat off and lift the carpet in the trunk. Take out the 10mm bolts holding the cover on. Unplug the fuel pump power and sensor plugs. Use fuel disconnect tool or small flat blade screwdriver carefully to disconnect fuel lines. Use snap ring pliers and pop the snap ring off the top of the sending unit. Pull the unit out. There will be a thin metal arm with a plastic float on the end, that is the fuel level sensor. Press the tabs on the level sensor and unmount it from the pump unit. Follow the two wires and unplug the connector. You can purchase the level sensor with arm separately from the entire sending unit and save a lot of money. Installation is in reverse order. Warning] make sure you get the new big o ring for the unit when you put it back into the tank. Its not required but recommended. Also for those having issues with the odometer and gear selector not working, you can take the cluster out and disassemble down to the circuit board, there will be 4 resistors in the upper right corner of the gauge face side, they fall off or lose connection due to poor solder joints. If they are still there, you can reflow the solder and the odometer will work. If they are missing or fell off, clean the contact pads, and resolder four 150ohm 1/2 watt resistors there and it is fixed.

My Buick gas gauge doesn't work correctly. It show full most of the time but also goes to empty to so how do I fix it.

The fuel gauge is not dependable. Even if the tank is full, if I let the engine for 2-3 minuets the gauge drops to empty and the alarm sounds. Is there an easy access to sending unit in the gas tank?

Thank you, Dominic

The gas gauge registers the correct amount when the car is turned on. However, while driving, the gauge goes over to full. What could be the problem.

I got a 2001 Buick Century with 113000 miles. The gas gauge stuck at full allthe times; when I turn the ignition key off the gauge come down to Zero. As soon as I start the engine, the gas gauge shows full regardless of fuel level in the tank. Do you have any ideas how to correct this problem?

Gauge either shoots to full, or drops down to empty. Does the sender have anything to do with the gas tank and specifically the FLOATER? I was told the the fuel pump and gas tanks floater is the cause of this issue.

I have a 2001 Buick Century I'm having the same problem I'll start my car it will go too full and within a few seconds it dropped all the way to the e the light will come on. I've seen there's a place in your trunk were you can reach fuel pump and sensor what do I look for?

The fuel gage is stuck on full. Every once in a while it will read properly and then go back to full. Also the odometer and gear selection goes off and on.

Recently my gas gauge started fluctuating when I accelerate. It only seems to happen when it is under a half a tank. The other day it jumped from a quarter tank all the way to a full tank then started to slowly drop back down as I let off the gas. What could be causing this problem?

Is the rheostat located in the tank too? Is there a way to test the rheostat? Where is the body control module, and is there a way to test that?