Question about 1999 Oldsmobile Cutlass

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Gas gauge basically shows either mostly full or empty

On our 1999 Olds Cutlass, the gas gauge drops to empty when there is still at least half a tank. When you fill the tank, it reads full. As you burn the first few gallons, it looks about right, then DING DING DING, the gauge drops like a rock.

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Sending unit in tank needs to be replced, drop down tank and replce

Posted on Jul 01, 2009

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1 Answer

Dash gas gauge stops showing proper gas level once it hits half a tank. Then gauge will fluctuate between empty (light will come on), full and anywhere in between but seems fine from full tank to half


If the trouble with the gauge started after you worked on it then you likely damaged or created a restriction to the movement of the sending unit. You will have to remove the tank and double-check your work.

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1999 S10 Gas gauge bounces from empty to full, nothing between


This problem is caused by the fuel level sensor inside the gas tank, you will need to drop the fuel tank out or remove the pickup bed to access the level sensor which is part of the fuel pump module on most GM products. The part is about $200.00 and 3 hours to install. See picture below. You can buy the part at a very good price from the on line company I use for parts www.rockauto.com
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The gas gauge says full when you start the engine and the electric range says 446 miles to empty then it will all drop to empty and the gas light will come on, so i never know for sure how much gas I have.


Sending unit gas gauge in the gas tank has gone bad and will need to be replaced. The gas gauge wire is grounding out causing you to have full full indicated and when there is no ground you get empty signal.

This is caused by the gauge in the tank having a bad spot on the float, which is common from wear and tear. Also if your lucky, it may just be the wire harness from the gas tank to the frame might be the issue and will need to be replaced. It worst, it's going to be the sending unit it self.

Thank you for using fixya and good luck

Oct 11, 2010 | 1999 Oldsmobile Silhouette

1 Answer

Gas gauge jumps from empty to what ever the tank is filled at .some time it shows half full etc then just drops to empty, then after a few minutes driving it goes back to a level.


I own two 1993 960s and on one the gas gauge sits on 0 until I thump (hard) the plastic lens in front of the gauage in the instrument panel. It is most certainly due to a cold solder or cracked solder joint. Can be a corroided contact.

Thump the gas gauge arrow like I do when it is registering 0. If it does not move then it is the sender in the tank that has a flat spot.

William White

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1 Answer

Gas gauge stays on full


very common. The sender in the gas tank is the problem.
It will need to be replaced some day
Both my gas tanks do the same thing in my F250. 1 tank stays full all the time and the other drops from full to about a half tank when I get to half a tank and then works so so till empty.

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Gas gauge is not reading correctly. Shows a full


the problem is caused by a defective gas gauge sending unit, this part is located inside the gas tank, you must remove the gas tank to replace it.

Dec 02, 2009 | 2002 Cadillac Deville

1 Answer

When the gas tank is full the gas gauge shows as empty. When the gas tank is empty the gas gauge shows as full.


Well that tells me that someone installed the wrong fuel level sensor. Your going to have to drop the tank and pull the pump and float assymbly out. Then go to a parts store and get a sending unit that has the opposite resistance of that sending unit. Just wait until the tank is empty so its a lot lighter. You can call the parts store or go down and see if there is multiple sending units. The sending units work by resistance, when the tank is full the float moves up and turns a wheel in the sending unit, which either removes or increases the resistance causing the gauge to lower. The sending units either give full resistance at full or no resistance at full and then changes as the level goes down until it does the opposite at empty.

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Wacky fuel gauge.


to coorrect this u will need to pull the gas tank and replace the fuel gage sending unit inside the gas tank, hwerwe is the part number for the fuel module which has the seding unit in it.
ACDELCO Part # SK1158

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1 Answer

Gas guage not working on 2001 oldsmobile Aurora


most likely you need a new sending unit, located in your tank

Jun 21, 2009 | 2001 Oldsmobile Aurora

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