Not sure what happened...
I pulled the negative cable off the battery and left it all night. I reconnected it this morning and also tightened the positive cable.
Cranked the truck and still fuel gauge did not register. I drove the truck about 12-15 miles, stopped to pick up my daughter. When I restarted the truck, the fuel gauge was working, showing completely full.
I had driven the truck close to 1 hour total since the problem first occurred. I read one post that stated it could take up to 55 minutes for the gauge to register a change in the amount of fuel (slosh mode?).
Is this possible? I've had a 99 F150 SC 5.4 4x4, and a 2001 Screw 4x4 5.4L and never had a problem like this.