Driving down the road, 1/2 tank of fuel, it acted like it was running out. I switched to a full tank, it straightened up. It usually goes to 1/4 before it does that. I do have the same old dip tube problem. But could that cause it to lose fuel at 1/2 tank? Another symptom in having is truck runs like a vat out of hell sometimes, and like hell other times? It has 230,000 on the original HPOP. Could that be on its way out?
Maybe more of the pickup tube has rotted away, so it's starving at 1/2 tank now. You've been needing to pull that pickup out of the tank anyway; I think your truck is just telling you it wants you to do it now.
Mine will run like crap, and then an hour later, on the same trip, it will start running like a scalded ape, the back to crap again. Back and forth. I don't know much about these electronic trucks. Kinda miss my good ole idi. Easy to diagnose!