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Bad sending unit on the aftermarket pump, (take it back and put in a new one, have had that happen) or could be a bad wire connection, thourougly check your wiring first. (Most aftermarket pumps require you splice in a new electrical connector, check them out good first)
If the trouble with the gauge started after you worked on it then you likely damaged or created a restriction to the movement of the sending unit. You will have to remove the tank and double-check your work.
its your sender unit. the sender unit is attached to your fuel pump it measures the amount of fuel in your tank and sends it to your fuel gauge. on most cars you can get to the fuel pump by looking under the rear seat if you find a plate with bolts around it you can easily access your fuel pump through there.
THIS PROBLEM IS CAUSED BY A DEFECTIVE FUEL GAUGE SENDING UNIT, THE SENDING UNIT IS LOCATED INSIDE THE FUEL TANK AND PART OF THE FUEL PUMP MODUAL ASSEMBLY, THE FUEL TANK MUST BE REMOVED TO REPLACE THE SENDING UNIT
this problem is caused by the fuel gauge sending unit being defective, the sending unit is located in the fuel tank, the cost ro replace is $364.79
ACDELCO Part # 25180048 SENDER KIT,FUEL w/LESABRE TIMING(WA2