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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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