[S10 Racer]

My son just bought a 2003 Chev. Duramax diesel with a 6.6 liter. My question is with the fuel gauge. It always shows 3/4 of a tank regardless if the ignition is on or not and does not move no matter how far you drive. Need some ideas what could be wrong. We have tried looking for a fuse for the fuel gauge but can't find one but I'm sure there is one.

[Valkyrie5.7]

Originally Posted by S10 Racer

My son just bought a 2003 Chev. Duramax diesel with a 6.6 liter. My question is with the fuel gauge. It always shows 3/4 of a tank regardless if the ignition is on or not and does not move no matter how far you drive. Need some ideas what could be wrong. We have tried looking for a fuse for the fuel gauge but can't find one but I'm sure there is one.

Does it have aftermarket white faced gauges or anything along those lines?

[jetnow1]

gm had a recall on their panels for that era- if you have less than 75,000
miles check with a dealer it may be covered. If it has over 75,000 miles
there are services that can repair your panel or sell you a rebuilt one.
Jim

[Rexnfx]

I would ground the sender lead to see if the gauge goes full, with key on. If it does, its probably a bad sending unit. But its good to check the BCM and ECM for codes and data too. But usually the fuel codes will make the fuel gauge read empty, if possible. And this wouldn't always set a check engine light.

If you had a scanner and the fuel % on data-stream said its 25% full but its stuck at 3/4 full on gauge. Then that might lead to some more difficult diagnostics.