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2015 Duramax 3500 WT Crew 4x4

 

Filled up the truck and when I turned the key on, the fuel gauge went all the way to full and all the way to empty like it always does, except it stayed at empty.

 

The shop that did my bypass last year says he doubts it’s anything inside the tank and hasn’t run into any issues with the newer model trucks.

 

Any ideas?

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On 7/8/2019 at 2:56 PM, davester said:

It just happened (as in, you weren't working on the truck and then right after this didn't work right)?

 

I would guess it's either the sensor in the tank or a wiring problem.

Yes sir! Every time you turn the key on, the gauge goes all the way to full and all the way to empty like it always does. But then it just stays at empty even though full.

Edited by Plumber101010
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So, the problem is somewhere before the instrument panel.  You might get some hints with an advanced code reader that can access the BCM,

 

But I would expect it to be the sender in the tank or perhaps a wiring problem between the sender and the bcm.

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