Question about 2000 GMC Denali

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My 2000 gmc fuel gauge will sometimes go from full to empty causing the low fuel light to come on. Also it does not ever go below 1/2 tank mark.

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Needs the fuel pump assembly....gauge sender is incorporated in this module...pretty expensive but the only alternative is to fill it up and reset your trip odometer each time...you should be good for 250 miles or better before next fill up!! good luck!

Posted on Sep 04, 2009

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Posted on Jan 02, 2017

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Fuel gauge reads empty low fuel light comes on but I have lots of fuel in tank whats with that will this cause the truck not to run


Its the start of your fuel pump going! Mine started the same way! Replaced pump because its all in one! $49.95 on line!

Jul 09, 2014 | 2000 GMC Sierra

1 Answer

I have a 1992 Mercury Grand Marquis Ls with a fuel gauge that does not work (gauge may be reversed)??? help please.


The fuel level indicating system is a magnetic type system, which consists of the sending unit located in the fuel tank, an anti-slosh module located on the back of the instrument cluster, and a fuel gauge located in the instrument cluster. The sending unit changes resistance according to the level of fuel in the fuel tank, which varies the current flow through the gauge.The pointer position varies proportionately to the current flow. In this system, the sending unit resistance is low (22 ohms) when the fuel level is low and high( 145 ohms) when the fuel level is high. The pointer of the magnetic gauge remains in position when the ignition is turned to the Off position. On some models, an anti-slosh module is used to dampen out fluctuating fuel signals from the sender. Some vehicles are equipped with a low fuel warning indicator. The anti-slosh module will also actuate the low fuel indicator when the fuel level in the tank reaches 1/16 to 1/8 full.


Do your other gauges/warning indicators work properly with the ignition on? If not, check for power at the fuse panel/fuses.

If they do then partially remove your cluster with connector still installed and check for voltage at cluster connector and gauge. Check continuity of cluster and gauge for ground.

Sometimes the anti-slosh module (if installed) goes bad in the Grand Marquis but not likely.

Sender troubleshooting:
  1. Perform test with resistors as follows:
    1. Disconnect wiring connector at sender unit, then connect resistor between gauge lead and a suitable ground.
    2. Turn ignition switch to On position.
    3. With 145 ohm resistor, the gauge pointer should contact the Full mark.
    4. With 22 ohm resistor, the gauge pointer should contact the Empty mark.
  1. Perform test with fuel sender of known quality as follows:
    1. Turn ignition to Off position.
    2. Disconnect wiring connector from sender and connect it to test sender.
    3. Move float rod away from fuel filter against Full stop position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or above the Full mark.
    4. Move float rod toward fuel filter against Empty stop position. Turn ignition switch to Off position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or below the Empty mark. If gauge works properly replace sender, which involves dropping fuel tank.

Mar 23, 2013 | 1992 Mercury Grand Marquis

2 Answers

Hi. i have a 2007 dodge nitro. i was just wondering how far can u go when your low fuel light comes on?


Traditionally when the fuel light comes on you have about 1/16 of a tank left. Depending on weight in your car and weather your driving highway or in town and the speed you are driving as well as the quality of gas and how efficient your car run (MPG) on average just a few miles. I recommend you get some gas before that light comes on. Gauges are never perfect and it may leave you stranded sometime.

Mar 19, 2011 | Dodge Nitro Cars & Trucks

1 Answer

Just filled the gas tank in my 2006 f-350 turbo diesel super duty (6.0), started the truck and the guage showed a full tank. Drove down the road about 1/10 of a mile and the guage dropped to dead empty...


A loose connection on the sending unit could cause the problem but also moisture in the tank in cold weather could also be a factor in which i would add fuel line antifreeze to a full tank of fuel..........Hope this helps you out.

Dec 17, 2010 | Ford F-350 Super Duty Cars & Trucks

2 Answers

Low fuel light On


The problem is with the fuel level sensor, it's attached with the fuel pump and located inside the fuel tank, sometimes the water and other impurities inside the fuel causes this problem, solution is to get the fuel pump opened by a professional and the problem might be solved by some simple cleanup. Hope it helps and comment if you need more advice. Please don't forget to rate the answer, it helps me, thanks!

Mar 29, 2010 | 2000 GMC Yukon

1 Answer

I have a 2000 GMC Sierra extended cab Z71 and my fuel gauge fluctuates.It takes it a while to register it has fuel and then it will just drop to empty then bounce back up. I was wondering what could cause...


The fuel sender is built on to the fuel pump. This happens sometimes if you run the tank low alot Try keeping the truck above 1/2 tank see if this helps otherwise you might need a new fuel pump

Dec 27, 2009 | 2000 GMC New Sierra 1500

1 Answer

2000 buick century custom. fuel gauge fluctuates between empty and 1/2 when level falls below 1/2 tank. low fuel light works. problem sending unit (how hard to change), gauge, or other?


The sender unit has a fine resistance wire with a slider to read the level, the slider or wires are worn and making intermittent contact, the low fuel light is a seperate switch so it will still work.access to the sender is usually under the rear seat cushon, under the soundproofing and a cover, have a look and describe what you have .

Nov 01, 2009 | 2000 Buick Century

2 Answers

Even with a full tank my 2005 Envoy XUV fuel light stays on and fuel gauge marks empty


u need to change this gauge or try to dissasseble and clean it very well then try to install it back again

Jun 06, 2009 | 2005 GMC Envoy Xl

1 Answer

1999 GMC Sierra fuel gauge is erratic


the fuel level sensor inside your gas tank might be defective
you need to drop the tank and check the level sensor

Apr 02, 2009 | 1999 GMC Sierra

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