Question about 2005 Chevrolet TrailBlazer

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My gas gauge bounces around and will tell me its empty when i just filled it up

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This problem is caused by a defective fuel gauge sending unit, it is located in the gas tank.

Posted on Jun 03, 2009

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This is a pretty common issue for Trailblazers to have. Here's a link with more information about these GM gauge problems. And where you can purchase replacement parts on Amazon if you'd like to repair it yourself.
How To Repair My Instrument Cluster

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2005 Trailblazer EXT V8- Just filled up my gas tank and its reading empty

Posted on Jun 19, 2009

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Posted on Jan 02, 2017

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1 Answer

What's the easiest way to change the spark plugs and my gas gauge bounces around alot it goes from full to empty. my 4wheel drive wont engage either


jack it up, use jack stands. take off the front wheels, and go in through the wheel well to get to the spark plugs. Gas gauges on every blazer is freaking crazy. mine acts up when it`s at a 1/4 tank. Park up hill it shows more, park down hill, it shows empty.

To much trouble to replace, unless you have the time and money to replce the sending unit.

Feb 16, 2011 | 2002 Chevrolet Blazer

1 Answer

2006 GMC Envoy XL gas gauge reads empty after filling continues reads empty and the light is on then the check engine light came on what can be the problem how ca i fixe it to save mesome $$$


It is most likely your fuel level sending unit has gone bad. It sits inside your fuel tank to tell the fuel guage how much gas you have in the tank.

The sending unit for the gas gauge is in the fuel tank and part of the fuel pump module, it is not sold seperately. Price is around $350.00, 2 hours labor to install the part.


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Feb 18, 2010 | 2006 GMC Envoy

1 Answer

Gas gauge shows empty after filling gas tank. Eventually the gas gauge will register the proper level.


The gauge circuit is shunted on most cars, this is wierd, but needed to stabilize the readings... Your description sounds like normal function. Drivers would complain if the qauge were to be instant, going around corners, starting, stopping, all move fuel, and the gauge would indicate this, cauing driver alarm...Been this way for ever, although yours sounds like it is on the far side of the scale...if it reads correctly after a while, you could replace everything and you would have the same performance.

Sep 05, 2009 | 2005 Buick Terraza

1 Answer

1994 Dodge Dakota Gas Guage not working all the time


Sounds like the sending unit is bad in the tank.

Jul 04, 2009 | 1994 Dodge Dakota Club Cab

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

1 Answer

Fuel gauge registers empty after fill up


It sounds to me like you have a short in your wiring harness at you fuel tank. there is a plug on top of your fuel tank that controls you fuel pump and your sending unit that tells you how much fuel is in the tank. This plug can be a real p.i.a to get to on some vehicles, you may have to take the vehicle to a shop to fix it, if you are not mechanically inclined.

Mar 03, 2009 | 2003 Ford Explorer

2 Answers

Seems like it's not getting enough gas


It could be your fuel pump with your car not running right, the gas gauge thing i have no clue maybe the sensor inside the tank is messed up. or it could just be your fuel filter not doing its job. Htere are a few things it could be I would say Fuel Filter, Pump and maybe a vacume (spelling) problem, I would need to be there and hear it running or drive it to really figure out what it is

Oct 21, 2008 | 1998 GMC Safari

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