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: 121,209 (12,600–260,000)
12 model years affected: 1990, 1992, 1994, 1997, more1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
178 people reported this problem
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problem details
2003 Cadillac DeVille 128,000 mi,
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.
1998 Cadillac DeVille 148,746 mi,
It goes to full to Empty idk how much gas is in it.. I just wanna know how can I fix this problem
2002 Cadillac DeVille 153,435 mi,
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
my car can be bone dry in fuel, but the dash shows full or half tank.
2000 Cadillac DeVille 130,000 mi,
Had to have fuel sensor replaced.
Fuel Sensor reports inaccurate fuel levels.
2000 Cadillac DeVille 111,000 mi,
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
2003 Cadillac DeVille 160,000 mi,
Gas gauge reads full when empty and shoots back and forth.never know how much fuel is really in there
2002 Cadillac DeVille 129,000 mi,
when is full tank it shows ok, as it go empty it starting to show is full tank, dtc P0463.
2001 Cadillac DeVille 115,000 mi,
THIS HAS BEEN A PROBLEM SINCE IT HAD 50k. I JUST FILL Y TANK WHEN I GET CLOSE TO 300 MILES.
2000 Cadillac DeVille 60,000 mi,
Replaced rheostat in the fuel sending unit.
2000 Cadillac DeVille 75,000 mi,
fuel indicator is not reliable
2003 Cadillac DeVille 118,000 mi,
already replaced fuel filter, but she still wants to stall...gonna replace entire pump next...??????
2003 Cadillac DeVille 155,000 mi,
When the gas gets low the needle jumps to full tank only when the gas gets low below 1/8 of a tank
1999 Cadillac DeVille 145,000 mi,
Been like this for over a year. I go by gal of fuel used window.
2003 Cadillac DeVille 154,000 mi,
Pump won't work nor gauge
when the tank is less than 1/2 full the gauge starts going back to full as the tank gets lower and lower
2001 Cadillac DeVille 75,600 mi,
Cadillac dealer diagnosis said the fuel level sensor was the cause of erratic fuel gauge readings. Need to fix competent repair shop that can do this job for reasonable cost. The fuel level sensor and fuel pump are accessible from inside the trunk, no need to drop the fuel tank.
2003 Cadillac DeVille 136,789 mi,
Gage works a first but as it goes down it moves any where it wants to then just pegs out on full but mileage indicator is way off ,miles till empty.
2001 Cadillac DeVille 129,955 mi,
Gas reads full half the time then it reads below half a tank even when I turn the switch without starting the car