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rpmdiag, Tech and Instructor
Category: Car
Satisfied Customers: 8065
Experience:  Since 1975
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Looking at this car gas gauge show empty gas tank is full

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looking at this car gas gauge show empty gas tank is full car tris to star but will not. 06 cts
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: looking to buy it
JA: Are you fixing your CTS yourself? What have you tried so far?
Customer: yes nothing
JA: Anything else you want the mechanic to know before I connect you?
Customer: no

Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

There are 3 possibilities to cause that. One is a bad gauge, two is incorrect communications via the computer to the instrument cluster and three would be a bad fuel tank sending unit.

The diagnostics needs to start with a scan tool doing some testing.

Please understand that I don't know your skill level or tools you
have to assist us. Also understand that I can't see, smell, hear, or
touch the vehicle either, so your patience is appreciated. JA is a
great Q/A site, but it does not replace a repair shop. So please
don’t shoot the messenger if I have to deliver bad news:)
If you are satisfied with my answer, I would greatly appreciate a 5
star rating now and I will still assist you after you have rated me
too if another question pops up. I don’t get credit for helping you
until you rate me.
Thanks again, Ron

rpmdiag and other Car Specialists are ready to help you
Customer: replied 3 months ago.
the car has been repossessed the tank is full but the car will not crank it just sputters like its not geeting enough gas could this be all caused by on problem like fuel pump and ending unit witch arent they both in the tank and maybe on the same fuse

Thanks for the call.