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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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