This evening when I filled the '06 the on dash never changed from '54 miles to empty' until I reset it, then it said (and still does) '-- miles to empty' and the needle on the gauge is buried in the red.

Any ideas?

 

Bad fuel sender, loose or broken wire. Any other symptoms? Do all the other gauges and trip meter function normally? How many miles on the truck and what mods?

 

All other gauges work normal.
57,324 miles.
Bone stock (ain't messin' with the warranty on this one).

 

fuel gauge sending unit. try some chevron additive.

 

Definitely sounds like a fuel sender or a bad wire. The fuel sender could be contaminated by sulfer, and as doubledee715 said you can try a bottle of Chevron Techron additive as this sometimes will clean the fuel sender contacts.

Here is the FMC broadcast message.
"19098 Multiple Vehicles - Sulfur Build-up On Fuel Level Sensor - Add "chevron Techron Plus Fuel System Cleaner" To Fuel And Fill With Fresh Fuel
Gasoline Or Diesel Vehicles May Exhibit Erratic Fuel Gauge Readings, Illuminated Mil, And Dtc P0463, P2068 And/or B1202, B2627 May Be Present. This Condition May Occur Due To Sulfur Contamination Found In Some Local Fuels Which May Cause Temporary Contamination Of The Fuel Sender Card. Before Replacing Any Component, Clear Dtc's, Drain Fuel Tank (if Facilities Permit), Add Techron Concentrate Plus Fuel System Cleaner And Advise Customer To Use An Alternate Brand Of Fuel. The Condition Should Correct Itself In A Few Miles. Advise Customers To Utilize The Trip Odometer To Monitor Fuel Consumption. Replacement Of Components Or Pcm Reprogramming May Not Fix The Concern. If Concern Persists Perform Normal Diagnosis And Repair. Obtain The New Techron Plus Fuel Additive Locally From Your Local Automotive Chemical Supply Source Or Auto Parts Store.
Effective Date: 02/22/2006"

 

My truck actually did the same thing all of the sudden, (and im not saying this is what your problem is) but mine ran for another day and the next my batteries were dead, might want to watch your gauges. even though the batt idiot light never came on, everything just died. 2 batts and an alternator later she runs great!