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.
Car Problem Reports
Cadillac DeVille Fuel Level Sensor Failure
Cadillac DeVille Problem
Average Mileage: 125,793 mi (60,000 mi - 230,000 mi)
Visitor, 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.
Visitor, 2000 Cadillac DeVille, 130,000 mi
Had to have fuel sensor replaced.
Visitor, 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.
my car can be bone dry in fuel, but the dash shows full or half tank.
Visitor, 2000 Cadillac DeVille, 60,000 mi
Replaced rheostat in the fuel sending unit.
Visitor, 2002 Cadillac DeVille
Fuel Sensor reports inaccurate fuel levels.
Visitor, 2003 Cadillac DeVille, 118,000 mi
already replaced fuel filter, but she still wants to stall...gonna replace entire pump next...??????
Visitor, 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
Visitor, 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
I also have the problem that you can't trust the fuel gauge - when it gets low, it will abruptly change to show full, then drop, then go back up again - it looks like you have a full tank when you're actually on empty! I've been stranded once, and it's been close a couple of times. I set the trip odometer to zero and always fill up, so when I get about 250 miles I fill up again. We had guessed it was the fuel level sensor or the fuel pump - it was good to find this to see that others had the same weird problem. I'll likely change the complete fuel pump module. I have also had a situation for the last couple of years where the car will not start on the first crank if it has sat for over 15 minutes - it always started right away. As time has gone on, it now can take even 3 cranks. I'm hoping changing the fuel pump will fix this also.