Fuel Starvation / Mechanical Fuel Pump
plumkrazee70,
Thanks for asking.
I vented the cap when I got to Iowa, but still had some stumbling with a full tank. After a few miles of driving, the stumbling subsided. Half way through the trip I also downsized the fuel filter and covered it in a head shield. I think the larger diameter fuel filter required too much fuel to fill effectively. I made the entire 4,000 mile trip w/ relative ease.
Long term, I'm going to switch over to an electric pump and braided lines.