[Low Elco]

Not for nuthin', but did you check your tank venting? Pinched/clogged, clearrrrr into the tank? I've seen 'em before where you're good to go at low speed, but at higher sustained speed (highway) you move enough fuel to vacuum lock the tank and the mech pump cant overcome it. Not just a new hose, I've seen 'em get plugged up inside the sender enough to do it also. Just a thought.

Truck looks great, congrats on the squeak eradication!