Question about 2003 Cadillac CTS

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2003 Cadillact CTS

I just put gas into the tank. My fuel gage read 1/2 tank. On the way home I notice my gage read empty. What the problem.

Richard
rbgrimes1@verizon.net

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  • Anonymous Mar 31, 2014

    the gage reads empty

  • Anonymous Apr 01, 2014

    car shows empty,but when 8 or 9 gallons are put in it, gages shows full .

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Sometimes beleive it or not its the gas cap is not sealing right

Posted on Jul 07, 2008

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Could be the gas cap but most likely its the float on the fuel pump sending unit. GM is notorious for making crappy fuel pump set ups.

Posted on Apr 07, 2012

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Just purchased a 2003 cadillac cts the fuel gauge does not work thought it was out of fuel ---filled the car up still does not work


The fuel sender is in the gas tank. If the gauge stays on empty then the sender may be bad . If the gauge reads anything else the wire between the sender and gauge is open. A bad sender can also give the same indication.

Sep 23, 2014 | 2003 Cadillac CTS

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FUEL GAGE DOES NOT WORK ON MY CADILLAC CTS 2004 WHY


The reader is not working, the reader can read either the gas is full or empty.

May 13, 2014 | 2001 Pontiac Montana

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Gas gage read full when empty and sometimes emty


You have a bad fuel level sensor.The fuel tank needs to come out and the sensor replaced.You don`t have to replace the pump assembly.You can get the level sensor separate.I`m not sure if the parts stores have it but I know the dealerships do.Hope this helps.Good luck.

Mar 16, 2010 | 2004 Pontiac Montana

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Chevy Venture have O2 error code and out of gas with 1/3 tank


02 sensors read the exhaust fumes and then adjust the car's air/fuel ratio by means of the car's computer. IF the gas guage is off, that would be the sending unit in the gas tank that is sticking

Jul 01, 2009 | 2003 Chevrolet Venture Passanger

1 Answer

Gas gage isnt right it keeps floating


The Sorento gs tank is under the floor in the back seat. Flip the seat bottom's forward and pull open the Velcro to access the top of the tank. The fuel pump and sender may be accessible from the top, but you might be unlucky and have t remove the tank.

May 21, 2009 | 2003 Kia Sorento

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

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