Question about 1991 Chevrolet Cavalier

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Gas Gauage 1991 Cavalier

The gas gauge on my 1991 Cavalier floats back and forth. When the level of gas gets down to about a half a tank, it seems to be accurate and does not float. Any suggestions.

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  • pinnerman Aug 18, 2008

    Same problem but the needle floats back and forth no matter how much gas is in it.

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  • 24 Answers

Bad ground on sending unit or bad sending unit. The sending unit is located in the gas tank and is inserted into the top of the tank. The tank needs to be removed from the car.

Posted on Nov 30, 2008

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4 Answers

Why does my gas gauge read half full when its empty.


it will help if you tell us what kind of car it is and dose this problem happen after you fill it while the car is running or is it off ?

Feb 02, 2015 | Cars & Trucks

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My oil and gas gauge on my truck jump .... gas gauge works fine till i get to about half a tank then it starts jumping.. oil gauge jumps from the time i start my car and regulates but when i slow down or...


You probably have a bad sending unit for the fuel level in the tank. this would cause the gauge to be erratic when the level is below 1/2 tank and the float is moving around much more than when full. The oil pressure gauge problem could be caused buy a loose wire connection or a faulty sending unit.

Mar 04, 2011 | Chevrolet Silverado 1500 Cars & Trucks

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My gas gauge seems to be acting up. When I get below half a tank the gauge will go up to full and back down again on it's own. It seems like it is only accurate when I put the car in park. what gives?


The float is what measures your gas levels. It is controlled electronically. There might be a loose wire or it could be going bad. You can usually get to them by moving the back seat. Others, the gas tank has to be pulled off. I hope this helps you.

Feb 03, 2011 | 1999 Oldsmobile Alero

3 Answers

Gas gauge is not registering level consistently . level changes up and down. i fill gas tank up and it will go down to a3/4 of a tank fairly accuratly then gets erraic, going to full and back 3/4 very...


sounds like its time for a new sendinding unit, this is the part that hold the fuelpump inside the tank, and has a float arm, this is what tell you how much gas is in the tank, heres a picture of it,this comes with everything even the pump,also make sure to wire in the new connector,these trucks have connector problem,good luck.also check the ground that go to that connector, follow them,may go to rear frame on the leftside, remove and clean them.d2f4ba0.jpg

Apr 07, 2010 | 1999 Chevrolet Blazer

1 Answer

Gas gauge jumps from empty to what ever the tank is filled at .some time it shows half full etc then just drops to empty, then after a few minutes driving it goes back to a level.


I own two 1993 960s and on one the gas gauge sits on 0 until I thump (hard) the plastic lens in front of the gauage in the instrument panel. It is most certainly due to a cold solder or cracked solder joint. Can be a corroided contact.

Thump the gas gauge arrow like I do when it is registering 0. If it does not move then it is the sender in the tank that has a flat spot.

William White

Dec 30, 2009 | 1994 Volvo 960

2 Answers

Fuel gauage isn't accurate, i drove 400km. and gauage indicates 3/4 tank full.why is this so.


The fuel tank probably got filled too much gas, and the float got bent, or the float was not installed properly, when the fuel pump was installed.

Dec 17, 2009 | 1988 Chevrolet Celebrity

1 Answer

When the gas tank is full the gas gauge shows as empty. When the gas tank is empty the gas gauge shows as full.


Well that tells me that someone installed the wrong fuel level sensor. Your going to have to drop the tank and pull the pump and float assymbly out. Then go to a parts store and get a sending unit that has the opposite resistance of that sending unit. Just wait until the tank is empty so its a lot lighter. You can call the parts store or go down and see if there is multiple sending units. The sending units work by resistance, when the tank is full the float moves up and turns a wheel in the sending unit, which either removes or increases the resistance causing the gauge to lower. The sending units either give full resistance at full or no resistance at full and then changes as the level goes down until it does the opposite at empty.

Jul 17, 2009 | 1999 Chevrolet Cavalier

1 Answer

Gas guage moves back and forth from emty to full with gas in it


it sounds like the level sensor on the sender (fuel pick up pipe in the fuel tank) is getting stuck. the level sensor is a float that is attached to the sender, and you will need to remove the fuel tank to get to it.

hope this helps.

Mar 18, 2009 | 2000 Chevrolet Blazer

1 Answer

Fuel gauge slowly reacting to changes in fuel levels


it will be your float in your tank, you have to drop the tank and replace the float.

Oct 14, 2008 | 1996 Subaru Legacy

1 Answer

Fuel gauge moves back and forth from full to empty


you have a bad sending unit inside your tank.
the resistance of the potentiometer inside is broke on the half tank part.

you have to replace it.

tnx 4 using fixya.

drcool

Oct 05, 2008 | 2004 Pontiac Grand Prix

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