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Where is the fuel gauge sending unit - 2000 Cadillac Seville

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In the gas tank

Posted on Jun 25, 2009

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Posted on Jan 02, 2017

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Gas gauge staying at empty when tank is full


Spencer, Check all fuses ,plugs and grounding at the tank.The sending unit module, inside the GM's gas tanks were notorious for going bad in this err, when you changed it did you use a quality part? Also the fuel pump sending unit plug/wire harnesses were known issues, so much that replacement pumps would often come with replacement plug to splice into existing harness. Check the attached links,instruction and guides on how to trouble shoot fuel gauge/sending unit, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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Aug 27, 2016 | 2000 Oldsmobile Alero

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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

1 Answer

Fuel sending unit test and replace


Checking and replacing a fuel sender unit ' How a Car Works

www.howacarworks.com/fuel.../checking-and-replacing-a-fuel-sender-u...
Learn how to check and replace a fuel gauge sender unit, and how to check a fueltank. ... Fuel pipe Sender lead Breather pipe Sender unit Petrol tank Filter Float arm Float Mounting flange Filler .... Test by quickly removing the filler cap.

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Jan 13, 2016 | Cars & Trucks

1 Answer

What's your question?fuel pump working but gauge nt working wts can be the cause.


Either the gauge itself, or the wire from gauge to tank, or the sending unit in the tank. Most of the time it is a problem with the sending unit.

They work like this: in the instrument cluster, a small voltage regulator sends low voltage through the gauge, into the wire to tank, and to the sending unit. The unit has a variable resistor that varies according to the fuel level, measured by the float arm attached to the unit. What it (the gauge) actually measures is resistance to ground-the current goes to a ground point after going through the variable resistor in the sending unit.

You can check if problem is the gauge or the sending unit by grounding the fuel gauge wire at the gas tank connector. Pull the electrical connector apart and locate the fuel gauge wire. Jumper that wire to ground on the frame while watching the fuel gauge needle for movement. DO NOT ground it for more than a split second, just touch to ground while someone watches the gauge. If the gauge needle moves at all (will probably go to full or empty), then the problem is the sending unit in the tank. The gauge is good, so is the wire from gauge to tank. I should mention that doing this test can possibly blow the meter (gauges) fuse in the fuse panel- why I said to do it just for a brief moment.

Jun 29, 2015 | Cars & Trucks

1 Answer

Fuel gauge gmc


It could be a loose connection on the gauge or the fuel sending unit.
The fuel sending unit can get worn and have breaks in the contact area that is used to determine float position to send the fuel level reading to the gauge.
I suspect that you have problem with the fuel sending unit considering that the light is on. I am assuming that the light that is on is the "low fuel light". Check your connections at the sending unit if the connections are secure then I would suggest replacing the fuel sending unit.

Jul 04, 2013 | Cars & Trucks

1 Answer

How to replace fuel gauge on 1984 Grand Marquis


Are you sure its not the fuel sending unit and not the fuel gauge itself.Because the sending unit controls the fuel gauge level and if the float gets stuck then the fuel gauge will not work.

Jun 26, 2012 | 1984 Mercury Grand Marquis

2 Answers

My fuel gage is reading full at all times and the radio will not come on is this a fuse issue or two different issues?


You definitely have two different issues as the fuel gauge and radio are on different circuits. The radio could be a blown fuse, which would require finding a short circuit. The fuel gauge could be as simple as a bad connection at the sending unit or a lost ground on the fuel tank. Disconnect the fuel gauge at the tank and with a twelve volt test light well grounded probe the harness terminals with the key on (engine off). The fuel gauge should move when the sending unit wire is probed, and the test light should light dimly. Other terminals are a ground for the sending unit, a ground for the fuel pump, and power for the fuel pump. If the gauge moves when the sending unit wire is probed the problem is either the sending unit or a bad harness connection. If the gauge doesn't move during the probe there is a wiring problem (open circuit) or a bad dash gauge. Hope this helps.

Jul 02, 2011 | 1998 Ford Windstar

2 Answers

Gas gauge quit working. Is there a fuse or sensor?


It sounds like your Fuel Level Sending Unit, usually located with the Fuel Pump inside the gas tank, has gone out. The Fuel Level Sending Unit sends the signal to your ECU, and then it goes to the Fuel Level gauge. Replace the Fuel Level Sending Unit and your gauge should be back to normal.

Mar 12, 2011 | 2000 Buick Century

3 Answers

Gas guage doesnt work


It sounds like a problem with the fuel gauge sender unit in the fuel tank which has worn out and gone open circuit and needs replacing. Access to the unit is usually through a removable plate in the floor in the rear of the vehicle. Disconnect the wiring connector and any hoses and then remove the securing screws. Replacement is done by reversing procedure.

Sep 16, 2010 | 1986 Lincoln Town Car

1 Answer

Fuel gauge does not work


What was the original problem? Most fuel gauge problems are either a bad fuel tank sending unit or a bad ground wire going between the sending unit and the frame of the car. The gauge and wiring can be easily tested using only a 12 volt test lamp, once you have access to the wiring at the fuel sending unit. This often requires draining the fuel tank and lowering it from the vehicle.
To test the gauge in the dash and it's related wiring, connect the 12 volt test light between the wire between the gauge and the sending unit (the one with power in it with the ignition on). Make the connection near the fuel tank sending unit. Connect the alligator clip on the test lamp to a known GOOD ground. The bulb in the lamp should glow dimly. The dash gauge should read somewhere between 1/4 to 3/4 of a tank of gas. (Varies with make and model) This will verify that the gauge is either good or bad.

Aug 09, 2008 | 1993 Saturn SL1

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