If you've had it long enough to know your range, and you've suddenly lost 100 miles on a tank, I don't think it's the sending unit with bad info.
At higher tank levels, the draw pressure isn't as much and any air mixed in goes unnoticed. But at lower levels, the beast raises it's ugly head. Like a drink straw with a split in it.
Usually this shows up as a fuel limp 1st, instead of just dead on the road though.
Another thing to consider too.....was there anything in the basket when you pulled it?
It's not unusual to see an additive cap seal get dropped in the tank, float around for years until it finally gets trapped in the basket at lower levels, randomly being sucked to the teat and causing problems.
2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
Last edited by Hook'em_Horns!; 01-15-2020 at 07:56 PM.