I have had this issue since I bought my '99 Malibu in '07. After I fill up, the gauge reads full as it should. For the first 75 miles the gauge seems to work (goes down a couple lines, maybe to the 3/4 line but im not sure if it's accurate or not), then it goes back to full. At around 130 miles, it tells me I have about a half tank only when the car is started, after I start driving it goes back up. In winter, right when I start my car it seems to read right once in awhile, but creeps right back up almost to full if I move my car whatsoever. (even by opening and shutting the door) After I go about 170-200 miles the gauge goes back to full and doesn't move until after I fill it back up.
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Re: fuel gauge faulty / gives weird levels of fuel
The fuel level sensor is bad. The tank will have to be taken down to replace the level sensor. There is little fingers on the resistor that wear down and loose contact causing the gage to read incorrectly.
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evap sensor won't go off ? Do you mean the check engine light ? What DTC - diagnostic trouble code ? fuel leveler system done ,your funny ! Fuel gauge sending unit of fuel pump ? With the fuel nozzle shutting off like that, the air in the tank is causing that , which means there is a problem with the Evap vent solenoid or wiring to the vent solenoid . Fuel Filling Troubleshooting Vent Solenoid
9 times out of 10 the fuel pump/level sender assembly is the cause. Sometimes the gauge pod is faulty, and there have been cases where there were either poor connector pin fit issues and/or chaffed/melted/cut wires in the harness that leads back to the fuel pump. It is an extremely common fault and would be surprised if the pump/level sender assembly wasn't the cause.
Talking about fuel gauge issues and how do you how do you diagnose, ... is the dash unit right here, and obviously the gauge doesn't read correctly. ... to fix the fuel gauge, so you can actually fix the fuel gauge electronically by reflashing the program. ... How to Troubleshoot a Malibu Fuel Gauge & Dash Light Not Working...Could be a bad fuse - fuse # 17 is a 15 amp fuse for the fuel gaugeCould be a bad float on the fuel gauge sending unit inside the gas tank (
it's with your electric fuel pump ) If the float gets a pinhole or
crack in it , the float fills with gas and sinks so the gas guage reads
empty all the time Could be a wiring problem
your car has a fuel level sensor on the fuel pump which is in the gas tank that is going bad this makes your engine light come on also makes your gas gauge read faulty, I think you can buy the fuel level sensor seperate from the fuel pump but i am not for sure my wifes car does the same thing i just havent got around to fixing it yet but when i do i will repost and et you know.
i suppose you have checked all the fuses and they all checked ok,the fuel gauge may be reading incorrectly due to a faulty sending unit which is mounted in the fuel pump module in the fuel tank,and the instrument lights may not work because the multi function switch may be faulty ,other than that you could have a electrical problem
Most likely it a bad fuel level sensor on you fuel pump. You will have to replace the fuel pump as that is the only way to replace the sensor for you fuel gauge. The sensor is built into the fuel pump. The contacts on the sensor become corroded over time and cause the sensor to malfunction causing your fuel gauge to read full all the time. I have a 2001 Montana extended version that had the same problem. In order to know when I needed to fill the tank, I would completely fill it each time I put fuel in and reset my trip odometer. I would go 400 miles on the tank before I would refuel until we were able to replace the fuel pump.