If you take the filler hose off, DO NOT DAMAGE IT thinking you can just grab a replacement hose for cheap. It's GM p/n 92225312.
Currently, the list price on that hose is $169.49 W..T...F??? Probably due to the fact it has a built-in clamp on the end of it.
EDIT: GMpartsgiant.com says the part is discontinued. Imagine that.
