Question about 2007 Buick Terraza CXL Wagon

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Fuel gage reads different every time I turn the key off and on, when i fill the tank it doesn't read full

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The sending unit in the gas tank is faulty, there is a variation in the accuracy of these gauges this may fall within the parameters of said parameters, however I would question the service department at your local dealership to make sure.

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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1 Answer

Gas guage shows over full all the time


You have lost the ground input to the gas gage. Its the black wire coming from the fuel pump connector at the fuel pump. Either the wire is broken or the input to the body control computer is broken, thus creating high Resistance on the input wire. The computer will think the tank is full, a shorted wire would indicate lo Resistance and read empty. Locate the fuel pump connector and jumper the black wire directly to the body (ground) and turn the key to run, check gage. If reads normal the wire is broken betwwen fuel tank and its ground location.

Jan 29, 2011 | 2000 Pontiac Firebird

2 Answers

Gas gage always reads full untill i turn off car


the fuel sending unit is probably stuck and need to replacing. common problems to many older vehicle it tend to read sometime correctly and sometime not at all. the sending unit will be in your gas tank.

Sep 30, 2009 | 1991 Jeep Wrangler

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FUEL PUMP MAKES NOISE PRESSURE GAGE READS 40 PSI ENGINE BEGINS TO SPUTTER MY PRESSURE GAGE DROPS TO ABOUT 20 PSI


Fuel pump is bad. At idle pressure should read 50 PSI. Replace with original manufacture fuel pump after market pumps will burn out fast and are unreliable from my experience. Also could have a bad fuel regulator but that only works while driving down the road full throttle. You can unhook the fuel rail pressure regulator and that will give it full fuel and the pressure reading should read 60 PSI while it is running. If you turn the engine off and turn the key to run position it should read 50 PSI and hold for 60 seconds, if it drops below 30 PSI after 30 seconds Pump is defective. Many pumps are going bad here of late as people have been running them less than ¼ tank and this kills the pump. The fuel cools and lubricates the pump so the lower the fuel level the worse it is on the pump below ¼ tank. Not to hard of a job to do if you want instructions let me know.

Sep 28, 2009 | 1997 Chevrolet Lumina

1 Answer

Gas gauge reads full all the time


hello, it sounds like it has something to do with your fuel sending unit located inside your gas tank,on the sending unit it has a float arm that reads the fuel level, some times that float arm gets jammed and wont show your actual fuel level,to fix this with your gas tank at least half full use a rubber mallet or any other object that wont damage the tank and with your key in the start position with the car not running but reading your gages hit the gas tank not to hard but hard enough to lodge the float arm loose, if this is unsuccessful then it will probably be a bad fuel sender location sensor located on the actual fuel sender if that's the case you'll need a new fuel sender. good luck and please send me a update or any questions let me know.

Mar 24, 2009 | 1997 Pontiac Bonneville

2 Answers

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

1 Answer

Gas gage constantly says full when it's not!


Unfortunately this is most likely the fuel pump module, which includes the fuel level sensor also. This should be diagnosed more thoroughly with a scanner, a good scanner will be able to check instrument cluster separately to confirm the gage is working right,and check for trouble codes that may not light any warning lamps. Hope this helps. Rate me please.P.S. Dont use that fuel station any more.

Jan 21, 2009 | 2002 Chevrolet Malibu

2 Answers

1996 Plymouth Grand Voyager Fuel Gage issue


It sounds like the fuel level sending unit located on the fuel pump is malfunctioning. The solution for this is to have it replaced. You can do this yourself but I wouldn't recommend it as the vehicle needs to be lifted and the fuel tank needs to be dropped out. This can be preformed for about 100-150 in most shops.

Jan 20, 2009 | 1996 Plymouth Voyager

1 Answer

Fuel gage wont read past 1/2 mark when using fuel


it is the pontimeter in the fuel sender you can buy it seperate from the whole assembly and they had alot of problems with them please rate -jeff

Aug 21, 2008 | 1998 Chevrolet C1500

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