There is a fuel level module which is the BCM that could be bad, let's try to unplug the harness to the tank and see if it drops down to zero. That would indicate a bad sender which is the most common cause.
Here is what you are in for when changing the fuel pump module out.
Here is a wiring diagram that will show how the system works.
Please run some tests and get back to us so we can continue helping you.
Images (Click to enlarge)
Wednesday, December 14th, 2016 AT 5:15 PM