Inlet On Fabricated Gas Tank Question

[SCOTI]

My short steel floor has that one rear bed 'runner' that interferes w/the filler inlet when swapping in a Blazer gas tank. I notched the runner & it clears the tank just fine, but the inlet exits directly into the area dedicated for the bolt that secures the bed.

I've decided to seal the original inlet & relocate a new one on the back side of the tank. There will be a 90° turn @ the floor where I plan to have the gas cap mounted & another @ the tank. Other than those bends, it's a straight shot. While I'm relocating the inlet, I thought it would be a good opportunity to increase the size too.

So that brings me to the question @ hand: What size/diameter is the 'common' fuel hose that's used to connect the gas cap 'hard lines' to the tank? I remember reading somewhere that some tanks have a hard to find fuel hose size so I'm trying to avoid that & weld in a common (easy to obtain) hose size. My 74 has a small hose & it's a pain in the arse when filling the truck @ the gas station..... so I'm hoping to go larger.

Thanks in advance.