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The fuel gauge maz's out when full but stops going down at about 1/3 of a tank when empty

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It sounds like your gauge is working perfectly but your sender unit housed in the gas tank is faulty......replace, as needed

Posted on Aug 26, 2010

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Posted on Jan 02, 2017

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1 Answer

Why would Fuel gauge fluctuate erratically then shake at blinding speed?


Bad sending unit, bad ground, bad gauge, I have seen sending unit go bad they will work part way.

Jan 02, 2016 | Cars & Trucks

1 Answer

The gas gauge on my 2001 Nissan Altima shows full when filled up, but only tets to 1/2 full when it is near empty. Suggestions?


Either the fuel tank sender in the tank is bad and needs replacement, or the fuel gauge is faulty. I would bet the one in the tank is probably bad, because that's usually the case. Find the connection at the fuel tank, disconnect it and use a VOM to get a resistance reading while the tank is empty and reading 1/2. It should match the specs.

Sep 24, 2015 | 2001 Nissan Altima

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How to test fuel gauge in dash 89 chev 2500 so I can tell if the gauge or tank unit is bad. The dash fuel gauge will change 1/4-1/2 tank overnight even if the truck has not been run.


To test the gauge,unplug the connector at the tank,the fuel gauge will go to full,then ground the wire to the fuel gauge,and the gauge should go to empty,I use a test light for grounding the circuit,to keep from grounding the wrong connector,when doing so,the test light will glow dim,and the gauge will go to empty slow.

Apr 20, 2010 | 1989 Chevrolet C/K 2500

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 gauge/tank


I am very familiar with this problem, u will need to replace the gas gauge sending unit in the fuel tank.

Jun 17, 2009 | 1996 Ford Ranger SuperCab

1 Answer

1993 Jeep Grand Cherokee gas gauge reads empty but tank is full.


Fuel level sending units are known to go bad on these.

Jun 13, 2009 | 1999 Jeep Grand Cherokee

2 Answers

Dashboard gauge


check the grounds on your fuel tank sending unit,must drop the tank to do this. with the tank down,remove the ground and look at your fuel gauge it should read full or empty,if it does not it may be a sending unit

Jan 15, 2009 | 1996 Dodge Caravan

2 Answers

I have a 2002 GMC Envoy, it starts missing when gas gets to 1/4


Maybe you are actually running out of fuel ,gas gauge is showing 1/4 of a tank when it is really almost empty . Would not have anything to do with the fuel filter , if it did it would happen when full also .

Jul 28, 2017 | 2002 GMC Envoy

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