How do you repair the fuel gauge on a trailblazer

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 want to do the repair yourself. Trailblazer Speedometer

Hi,

What's happening is your gauge motors are wearing out, pretty common on the 03-06 Trailblazers. Check this page for details on the problem and how to get it fixed - trailblazer instrument cluster repair

Common problem on the 03-06 Trailblazer instrument clusters for the fuel gauge to go out. It's usually caused by one of two main problems, either the stepper motor on the cluster's circuit board is going out or the sending unit on the fuel pump is going out. Check out this blog post about the problem - Trailblazer fuel gauge problems

Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Trailblazer instrument cluster repair

Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Trailblazer instrument cluster repair

Most likely the stepper motors which drive the speedometer and fuel gauge are defective and need to be replaced.

Common problem on the 03-06 Trailblazer instrument clusters for the fuel gauge to go out. It's usually caused by one of two main problems, either the stepper motor on the cluster's circuit board is going out or the sending unit on the fuel pump is going out. Check out this blog post about the problem - Trailblazer fuel gauge problems

this problem is caused by a defective fuel gauge sending unit, the sending unit is inside the gas tank, you must drop the fuel tank out of the car to replace the sender, it is part of the fuel pump module.

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

No, unfortunately it does not have a separate fuse.
The fuel gauge receives a fuel level serial data message from the ECM/PCM and displays it. You may want to check with your local Chevy dealer and see if there is any instrument panel cluster software updates available to correct the problem. If not, chances are the gauge is defective.
Good luck and let me know.
Regards,