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
SOURCE: fuel gauge bounces up and down
need a new gauge for the fuel tank/ If you need to drop fuel tank try to make it with less than a qtr tank they are pretty heavy to dop out/ Please rate my response thank you very much
SOURCE: fuel gauge bouncing on 2000 chevy tahoe where is fuel pump relay
fuel sending unit is in the tank. this is normal after about 75k miles and up. pump and sending unit are sold together. fuel sloshes from front to rear making the float on the sender rise and fall.
SOURCE: Bouncing fuel gauge
make sure your ground from the sending unit in the tank is good. it is usally rusty a few years from being on the road. you will need to remove it. put a new end on it and reattach it if it is rusty. if it is not rusty you need a new sending unit in the gas tank.
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