James’ 1974 W200 build

Yes, at the end of the hose there was something molded into the hose itself. I think it was just a really small hole, like it necked down really tiny inside, not a check valve.
But because the factory sender had a 1/2 tube on top that went to the filler neck overflow, I drilled the original vent hole a little larger to accommodate that AN fitting and I’ll now use that as the filler tube over flow. And then use the vent on the Aeromotive unit plumbed to a rollover valve... hope that works.
I was just dealing with that as I was hooking up the Factory lines that I refurbished. I swore that it was clogged but then I got to cleaning it out and it rattled.. then I figured out it was a check valve... For the life of me I've seen one of those around my shop and I searched and I searched and I searched a couple days ago... The reason I noticed is because about an hour ago I stumbled upon it when I wasn't looking for it just like I knew I would one day...