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With a diesel you might get lucky with a good diesel friendly fuel system cleaner from what I have read. It possibly can clean the varnish off of the sending unit and "fix" the gauge reading.
My 06 V10's fuel gauge quit working completely and will be replacing the fuel tank assembly when I have time to do it.... no possible easy fixes for the gas.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.