Ok guys for some reason when ever my tank is almost empty the gauge says its almost full or it changes from time to time. Like one time when we were almost empty it said we had a full tank about three seconds later it started dinging. I have a 1999 Pontiac Grand Am GT. This isnt a problem im really worried about b/c i usually keep the tank full. Im just wondering why it does this. How exaclty does a gas tank tell how much gas is in there? Thanks!
2007-08-03 09:06:42 · 2 answers · asked by Thomas I 1 in Cars & Transportation ➔ Maintenance & Repairs
The fuel level sending unit is most likely bad, it is a lever with a float on it that works like a volume control on a radio. When they start to wear out they get bad spots where the gage loses contact causing the reading to be off. The sender is in the tanks but they are not to hard to replace. Below is a GM TSB that covers this issue.
Fuel Gauge - Inaccurate/Fluctuating Reading
Notes
File In Section: 6E - Engine Fuel & Emission
Bulletin No.: 83-63-20
Date: October, 1998
Subject:
Inaccurate/Fluctuating Fuel Gauge Reading
(Replace Fuel Level Sensor)
Models:
1999 Oldsmobile Alero
1999 Pontiac Grand Am
Built Prior to the Following VIN Breakpoints:
Model Location VIN Breakpoints
Alero Lansing Plant C XC310439
Grand Am Lansing Plant C XC523682
Lansing Plant M XM771844
Condition
Some customers may comment that the fuel gauge reads empty when tank is full; and/or are experiencing erratic fuel gauge readings.
Cause
Usage of certain fuel formulations may result in high resistance outputs from the fuel level sensor, resulting in erroneous fuel gauge readings.
Correction
Replace the existing ceramic fuel level sensor with service kit (P/N 25317985), following the instructions provided in the kit and those found in the applicable Service Manual.
Parts Information
P/N Description
25317986 Kit, Fuel Level Sensor
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Description Labor Time
L1197 Sensor, Fuel Level - 1.2 hrs
Replace
2007-08-03 09:14:32 · answer #1 · answered by bikertrash 6 · 1⤊ 0⤋
the sensor in tank is getting hung up.gas will read most accuately when on level ground not moving
2007-08-03 09:12:54 · answer #2 · answered by Anonymous · 1⤊ 1⤋