Uneven fuel level in tanks.

[SquareOne]

Thanks for the follow up...not long ago I had a similar issue with a Cascadia. It was a bee nest (as odd as it seems) inside the driver tank vent. I make it a habit to check these regularly, but this nest was about a 6-8in into the vent.

Long story short, it caused all the fuel to be pulled from the pass side tank (and shut the truck down of coarse). Simple fix, but a large headache at 12-1a on a Sunday night lol.