2002 Cadillac Deville Logo
Posted on Dec 02, 2009
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Gas gauge is not reading correctly. Shows a full

Gas gauge is not reading correctly. Shows a full tank but the tank is not full. The gauge will not move from full tank until more than half a tank is gone. I have a 2002 Cadillac Deville DTS. How can I fix this?

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Marvin

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  • Cadillac Master 85,242 Answers
  • Posted on Dec 02, 2009
Marvin
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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.

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  • Posted on Mar 25, 2010
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Weired i have the same problem with my 2002 deville. my gas guage dont work either same thing says full then dropps to empty when dry empty. emissionwiz had the answer but im wondering how much it costs to have the gas tank dropped and a new sending unit put in. any idea?

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  • Posted on Feb 28, 2010
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Car won't start have replaced the fuel pump,crankshaft sensor. the car cranked about five times and now during the same thing as before turn over and won't start.

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If you cannot fill the tank because of an erroneous reading then it is time to replace the gas gauge sending unit responsible for the anomaly. Hope fully you can do it from the trunk - otherwise you will have to drop the gas tank to gain access.
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Gas gauge shows empty after filling gas tank. Eventually the gas gauge will register the proper level.

The gauge circuit is shunted on most cars, this is wierd, but needed to stabilize the readings... Your description sounds like normal function. Drivers would complain if the qauge were to be instant, going around corners, starting, stopping, all move fuel, and the gauge would indicate this, cauing driver alarm...Been this way for ever, although yours sounds like it is on the far side of the scale...if it reads correctly after a while, you could replace everything and you would have the same performance.
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Gas gauge basically shows either mostly full or empty

sending unit in tank needs to be replced, drop down tank and replce
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Gas Gauge

This condition is caused by a defective fuel guage sending unit, it is located in the fuel tank
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