Question about 1995 Lincoln Town Car

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Fuel gauge error

My car reads full at start up, then goes to empty regardless of how much fuel is in the tank. Is this s ground problem, or a sending unit problem?

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The best way is to use a gauge tester to vary the resistance to the dash gauge. You will need to unplug the harness back at the tank and connect there. It will either be a pink wire or a yellow wire to the gauge.

Posted on Aug 20, 2008

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2 Answers

I dropped the tank on my '99 Durango, installed a new fuel pump unit but the fuel gauge still shows empty. How do I troubleshoot?


The fuel gauge is directly controlled by the fuel sending unit inside the fuel tank, it sends a ground return signal back to the fuel gauge. I am assuming of course that your fuel gauge is okay. To test your fuel gauge, connect the wire which goes to the fuel sending unit to chassis ground. Your fuel gauge should respond and indicate Full Tank. If not, there is a broken wire somewhere between your fuel gauge and the sending unit. Before connecting the wire that goes to the sending unit to ground, check it first with a DC Voltmeter, you should be able to read +12volts. Be sure that you turn your ignition switch to it's ON position.

Apr 28, 2016 | Cars & Trucks

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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

I have a 2003 Buick regal the fuel gauge reads full at start up and then drops to empty just replaced the fuel sending unit and it still doesn't work what else could it be?


open curcuit guage will read full. grounded curcuit it will read empty. if wire to sending unit at the tank is broken or corroded. good-day!

Apr 09, 2014 | Cars & Trucks

1 Answer

1984 Ford F150 Fuel gauge reads empty


I would bet the sending unit is bad but lets check it, a good test i use is that i have a used sending unit i connect to wiring to test the gauge and wiring, if the gauge moves when i move the testing unit then i know the gauge is good and the wiring to, locte the connector at fuel tank, and unplug it, this will be the one the leads to top of the tank and the connector will be on the side be the frame on drivers side, the way you know you have the right connector will be the truck will not run as this connector has the sending unit and pump wires in it, if the gauge goes to full then you know the wiring is good and the gauge is good, you can jump the two wires and gauge should go to full also. the problem is you must get the right wires for sending unit or you may pop fuse, let me see if i can get you a wiring diagram or just do the full test by unplugging connector.

Okay, your sending unit has a yellow and white wire, thats the sending unit wire, the other is a ground and we wont worry about that. so if you want to see if gauge will go to empty or full just unplug connector and gauge will move to full then if you take a wire and jump the yellow wire with white stripe to a good ground the gauge will go to empty, the thing is your gauge is on empty so sending unit may be grounded out, good day10_21_2012_4_15_34_pm.gif

Oct 21, 2012 | 1984 Ford F 150

1 Answer

Gauge reads full when tank is empty


You have a bad ground, you will have to remove the fuel tank and check the connectons on top of the tank, probably corroded. You can clean the terminals or change them.

Sep 09, 2012 | Ford Escort Cars & Trucks

1 Answer

70 c10 fuel gauge


You need to check voltage at the gauge on the dash.
They would stop at random places with the key off.
You can disconnect the sending unit in the tank and ground the gauge to test.
Some models read empty with high resistance from the sender, some are opposite depending on the sending unit. The sending unit in the tank is a resistance bar for the ground circuit.

Jul 03, 2012 | Cars & Trucks

1 Answer

I have a 2004 Vette. This weekend during a road trip the gas gauge went from half fuel to empty and gave me a low fuel digital error, then went back to half full. It did this several times over the trip


It sounds like the ground wire to the sending unit(located in tank) might be loose. The ground wire usually starts at the top of the tank at the sending unit and goes to a portion of the frame. Or the sending unit could be going bad.

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2 Answers

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pos lead is used to measure ground...that means that the power goes through the fuel level sending unit and the ground lowers the power out from the unit....I would replace the fuel level sending unit.

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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.

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