It would be a good step to check for codes, more than likely the PCM would store a code related to a malfunction with fuel transfer. A code reader or better yet a scanner that can read the fuel level sensor data could be valuable here.
The fuel level sensors are known to cause problems on these trucks. Im not saying you need to replace the part(s) but keep this in mind. A malfunction in either fuel level sensor will disable the system. So the front tank level sensor could be faulty too. Most malfunctions detected by the PCM should cause the fuel gauge to drop to "E"
It also seems like its a bad idea to fill the rear tank first, or fill fuel with the key on and/or engine running. This can "freak out" the PCM when it see's strange fuel level readings and if the PCM see's that and stores a code then the transfer system will be shut down. Remedy for this might be to reset/erase codes and check system from proper operation. If you don't have a way to erase codes, try unplugging the battery for a few mins.
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Today's Featured Article - On the Road with Dave Gohl: Deere Departed Friend - by Dave Gohl. Have you ever had to part with a dear friend? It's not easy. If it's due to death, your feelings could be in disarray for days, months or even years. Even now after almost 4 years, I still miss my dad. I remember when I was a kid my dad sometimes would tuck my brother and I in at night and we would ask him questions about his childhood on the farm. To this day, it's some of the best stories I've ever heard. And now, I'm so glad that I asked those questions, and if I were a little smarter i
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