2005 fuel gauge is not reading properly

you should be able to find the fuel tank harness under the car near the fuel tank. If you look just in front of the rear axle on the drivers side you will see two connectors Unplug the connector with the grey, purple, black, and black/white wires.

Ground the purple wire. Turn the key to the run position. The gauge should read full. If it does you have a bad sending unit (the part in the tank that tells the gauge what the fuel level is at).

If the gauge still reads empty you have a bad gauge.

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Dash module faulty or has lost it's ground connection--have qualified person test the module AFTER checking for grounding problem.

Possibly a bad ground wire at the sender on the tank,

Check for that first before tearing into the dash to replace the guage.

earth prob

Hi, check the ground at the fuel sending unit at the fuel tank. this wire may be corroded. if the wires are in good condition, replace the fuel sending unit.

The float is sticking in the fuel tank.Could be expensive if the float is part of the fuel pump.

Hello. this is caused by a bad fuel level sender in the fuel tank. you will need to drop the fuel tank and replace the sending unit

Hi, this is being caused by a malfunctioning sending unit that is locate inside of the tank and is part of the fuel pump assembly. replacing the sending unit will fix this issue.

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Most likely this is the common 03-05 Cavalier instrument cluster problem where the stepper motors on the cluster's circuit board go out. It can be fixed, check this page for more on how to get it taken care of - Cavalier fuel gauge broken

it will be intr cluster fuse sometimes two of them one inside in fuse pannel and then outside in the engine compartmaent