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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Posted on Jan 02, 2017

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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


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8_8_2012_11_10_24_pm.jpg

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How can i get to the fuel tank send unit only reads half full


well if you have it an empty fuel light came on to your dash, then you have travelled and just consumed the whole entire reserved gas in your tank, so when you are filling it up again, it will fill-up first the reservoir for your reserved gas then if it reach the minimum level of gas in your tank, then the fuel sensor unit will tell you now the exact amount of gas level on your gauge just keep filling it up (gas), DO not Press the entire trigger of the pump, just press it half way and moderate while filling -up gas so wont stop clicking and you thought that you have your tank full already but it was not.

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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

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