Erratic Fuel Gauge Operation on Cadillac Seville STS

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: 126,253 (70,000–199,000)
8 model years affected: 1990, 1995, 1997, 1999, more2000, 2001, 2002, 2003
25 people reported this problem
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problem details
2000 Cadillac Seville STS 109,000 mi,
When the actual fuel level is just below 1/4 tank the guage will float to full and stay until the car is shut off.
2003 Cadillac Seville STS 79,000 mi,
When the fuel level gets low, such as quarter tank, it jumps around and goes to three quarters not reliable have to keep full
1997 Cadillac Seville STS 161,032 mi,
Gas gauge reads full even when it is almost empty. Once I fill the the tank the gauge is up and down until it settles to full.
When level is quarter full readings are erratic,not reliable
1990 Cadillac Seville STS 70,000 mi,
Fuel guage showed irradic readings. Replaced the sensor to resolve the issue.
1990 Cadillac Seville STS 130,000 mi,
fuel gauge reads incorrect fuel quantity
1990 Cadillac Seville STS 117,850 mi,
1/4 tank and it goes nuts so I keep track of gallons used
2003 Cadillac Seville STS 94,450 mi,
Gauage goes up and down, then flat empty. Had to call AAA for gas!
2002 Cadillac Seville STS 199,000 mi,
Fuel tank level fluctuates up and down while driving
engine shut down, reads full, towed to shop. Low pressure, added gas. pressure up & started right up, bad fule sensor. replaced complete fule pump modual to fix.
Fuel level is always wrong. Sometimes it shoots to full, then immediately drops to E.