Question about 2000 Chevrolet Blazer

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Gas gage stays at full for a long time then drops to 3/4 and will drop to empty thenbounce back up so i never really know how much gas i have.

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This issue is most often caused by the sending unit, in the tank. Remove it and test it with an ohm meter, I expect you will find it gives similar results, if so, replace it.

Posted on Mar 17, 2011

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The petrol gage is not working how do I fix that it is a Chevrolet captiva ltz 4x4 2008 model


Unfortunately, it's usually the sending unit that's gone bad, it's inside the gas tank.
Very few vehicles have an opening in the floor directly above the gas tank to pull the sending unit and pump. Usually you have to jack up the vehicle and drop the gas (petrol) tank.
The replacement part is cheap and a mechanic should be able to do the repair for a decent price. They have to remove most of the petrol before removing the tank so I would get the tank close to empty before bringing it in. (I know, without a gage it's hard to guess)

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Code 463 on 2006 Ascender which is fuel sensor high input. Where is the sensor so I can replace it. Gas gage is stuck on empty although my tank is full. Was fine and then it was eratic and then just stays...


It's in the fuel tank. The book says you have to drop the tank, but i'd still check for an access panel inside the car. I dropped a tank once, following the book instuctions, and found the panel after I removed the tank.(not on this type of vehicle though)

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My gas gauge was on full and dropped to empty. hen


this could be a faulty sender in the tank or just a bad wire to the tank sender

Mar 29, 2010 | 2007 Chevrolet Malibu SS Sedan New Cars

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Gas gauge stays on full


very common. The sender in the gas tank is the problem.
It will need to be replaced some day
Both my gas tanks do the same thing in my F250. 1 tank stays full all the time and the other drops from full to about a half tank when I get to half a tank and then works so so till empty.

Dec 22, 2009 | 1992 Pontiac Firebird

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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

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I have a 94 chevy s10 and my gas reads empty while i drive.but when i shut off the truck the gauge moves to different readings.


Is......the problem--"the gas gage reads empty when there is fuel in the tank. OR, The gage moves when the key to turned off ?

If it's the first,
You will need to test the gage and through process of elimination, determin if the Sending unit inside the fuel tank has gone Bad.

If its the second ? - Electrical gauges will move when powered down. Normal

Testing the gauge may not be easy - just depends on your ability.
It is a simple 2-wire gauge circuit, when disconnect (usually need the fuel tank) the gage reads in one direction (either full or empty)
then when shorted-the gage reads in oppisite direction.

Of course you must select the correct wires or you may short out the wrong circuits!! Most GM vehicles use a purple wire & black wire.

A quick method I have used to check the in-take part of the gauge is this.
1st. know there is gas - 1/2 tank works best.
2nd driver's door open, key in run position, engine not running.
3rd gently lift up on the door then let if come back down, gently.
just enough to cause the gas to slosh around.
4th - keep an eye on the gas gage, a bad sending unit in the take will show up as a "twitchy" needle.

Of course, if the gage never leaves empty - sloshing won't work.
I have a known good sending unit I can plug into the vehicle and simulate different levels of fuel - if the gas gage works, I know the problem is in the tank.

Let us know.

Dave

Feb 28, 2009 | 1996 GMC Sonoma

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