Erratic Fuel Gauge Operation on Cadillac DeVille

It is common for the fuel level sensor in the fuel tank read the fuel level incorrectly. The sensor must be replaced to correct the condition. Our technicians recommend having the complete fuel pump module replaced on high mileage vehicles.

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Average mileage: 120,447 (12,600–260,000)
9 model years affected: 1992, 1998, 1999, 2000, more2001, 2002, 2003, 2004, 2005
137 people reported this problem
67 people shared problem details
2003 Cadillac DeVille128,000
Fuel sensor seems to report accurate from full tank to just under half a tank. Then it starts going up towards full again as the tank further empties.
38 people like thisFlag inappropiate
2000 Cadillac DeVille130,000
Had to have fuel sensor replaced.
14 people like thisFlag inappropiate
Fuel Sensor reports inaccurate fuel levels.
11 people like thisFlag inappropiate
2001 Cadillac DeVille115,000
THIS HAS BEEN A PROBLEM SINCE IT HAD 50k. I JUST FILL Y TANK WHEN I GET CLOSE TO 300 MILES.
9 people like thisFlag inappropiate
2002 Cadillac DeVille153,435
Fuel gauge does not work properly shows full most of the time can't afford to have fuel pump to be pulled out of the gas tank
8 people like thisFlag inappropiate
my car can be bone dry in fuel, but the dash shows full or half tank.
8 people like thisFlag inappropiate
Replaced rheostat in the fuel sending unit.
6 people like thisFlag inappropiate
2000 Cadillac DeVille111,000
guage reads true (I think)when I turn key on but when the car starts the guage will read full and not move till car is turned off-hv not been able to fix or hv fixed-any ideas ? loumenn @yahoo.com
6 people like thisFlag inappropiate
2002 Cadillac DeVille129,000
when is full tank it shows ok, as it go empty it starting to show is full tank, dtc P0463.
3 people like thisFlag inappropiate
2003 Cadillac DeVille118,000
already replaced fuel filter, but she still wants to stall...gonna replace entire pump next...??????
2 people like thisFlag inappropiate
fuel indicator is not reliable
1 person likes thisFlag inappropiate
1999 Cadillac DeVille145,000
Been like this for over a year. I go by gal of fuel used window.
1998 Cadillac DeVille120,000
Information center reports inaccurate fuel levels. Diagnosed it by using your sites and others. Have not yet replaced it.
2001 Cadillac DeVille147,000
fuel gauge gives incorrect reading ALL the time. It either reads full, or it starts out at a half tank and within 1 minute reads full
Electronic Fuel Guage reads F for Full. Digital miles remaining is 225. Ran out of gas with it still displaying Full tank.
Fuel tends to read full all the time.
floats back and forth, never reads correctly. I use the gas consumption computer readout to tell me when I need gas. Based on maximum gallon capacity. Once it reads 14 gallons or so used, I know I have about 2 gallons left, and fill when able. Has worked almost exactly correct. It tells the gas used, and when I fill it, it is almost exactly the same amount pumped in until it's full
fuel gauge was erratic while car was started or car was in idle or car was at speed. in process of ordering a new fuel pump with sending unit ebay less than 60.00..
Noticed the same issue. Bought the car at 87000 on the ticker. Whenever the miles per tank raises, the fuel bar does not go down. Haven't gotten a new fuel pump. Always fill it up all the way and know I get roughly 360 miles per tank.
1999 Cadillac DeVille122,222
show tanks is full always
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