Close
Gas gauge is not accurate, floats back and forth
1999 Chevrolet Cavalier

Gas gauge is not accurate, floats back and forth

(1999 Chevrolet Cavalier)
Hi,
My gas gauge on the instrument panel does not accurately report the fuel level. In many cases it will lean toward the full mark. Once in a while it will accurately go to the correct level, but then will float back to the full mark or close to it. My fuel pump is working fine. Any suggestions?
3 answers & 4 comments
Popular Answer
on January 12, 2011
why does my gas gage go back and forth and what will it take to fix it
Sign in to reply
General Diagnosis
$88 - $111 Learn More
on January 12, 2011
why does my gas gage go back and forth and what will it take to fix it
Sign in to reply
on August 23, 2010
Chevron has a fuel system additive called Techron Concentrate Plus. The formula with the "Plus" is specifically designed to help with this very common GM problem--it's caused by corrosion on the fuel sending unit in the gas tank.

If a couple of tanks with the Techron Concentrate doesn't work, then you are probably out a bundle for the fuel sending unit.
Sign in to reply
on August 24, 2010
Ok, I will try that. thanks for your quick response.
on January 25, 2011
ya, after a 1/4 , mine likes to float too.
Cheveron is temporary fix if it works at all. You will need to replace the sending unit inside the tank itself to insure trouble free problems again. Oterwise you may be looking for a ride to a gas station on the highway.
Sign in to reply
Thanks for pointing that out. You can easily monitor your mileage to avoid running out of gas whether the gas gauge works or not.
on November 26, 2010
I replaced the sending unit in my 97 Buick LeSabre and it still reads full all the time. Wish I knew what is causing it.

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
Would like to change to positive traction for our race car.
Engine light came on, took car to mechanic and he said i needed new alternator. replaced alternator and engine light...