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Drop some Power Service 911 in the tank and see if you have a bit of ice or paraffin in the pump housings that needs to be dissolved.
If the transfer pumps are working flawlessly and there is no ice or paraffin built up, then I would suspect the VP44 front housing fuel circuit diaphragm has failed and is letting fuel bypass the injection pump pressure circuit. Unfortunately, if that occurs it is time for a rebuild.
That front VP diaphragm fails if the truck is run without pressure to the injection pump, and sometimes it only takes an instant on one with some time on the pump. If you do need a rebuilt VP, look for one with the new linered rear housing that keeps the case from eroding around the timing valve.
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