Question about 2001 Cadillac DeVille

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Gas gauge 2001 deville reads from half to full but will not go down to low or warning of no gas

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This is a common problem on this car..i also have a '01 deville with gas gauge problems similar to this.....I have been told that its a relay of some sort on the back of the rear seats....very easy to access from the trunk after removing some "removable" carpeting....I havn't looked further into the issue yet.......( i.e. finding what relay)....i currently use the " - - gallons of fuel used " feature on the menu to calculate how much i have...call your local dealer and ask what this relay is and then buy it somewhere else...(auto zone or something)

Posted on Feb 02, 2010

Testimonial: "Was told have to remove gas tank 600 to 700 dollar cost.Have friend owns gas station will ask him...Thanks and giving car to grandson..thanks for help"

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1 Answer

Gas gauge


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The fuel sender is in the tank and is part of the fuel pump module ( all in one). the fuel sender is a rheostat and is like a dimmer switch in you home to dim lights, the higher the level of fuel the more voltage the computer sees hence the lower the fuel the lower the voltage it sees. With the age of the car this is likely the problem. But there is a part in the instrument cluster that reads this voltage and sends power to the gauge intermittently. In older cars it was called a anti slosh module. It was there because as the car went up and down a bumpy road the gauge would read erratically. the cost can be prohibitive to fix this but if you can live with it i would. If not expect to spend 600 dollars or more to trace it down and fix it.

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