Fuel tank hoses

[hatzie]

A - Fill pipe vent line. Use it. It'll want to kick off the automagic gas pump handles if you don't connect the fill pipe vent line.
B - Tank vent. Use a differential vent cap on a hose terminated so the cap is above the level of the fill pipe... or route it to the VENT connection a 1970's 3 hose charcoal can.
C - Suction line to the fuel pump.
D - Return line from a three hose fuel pump. If you don't want vapor lock issues you need to plumb this up.

You don't have to use the overcomplicated BS job GM came up with with forty lines attached to it. The 3 hose 1972 Corvette evap can is easy to plumb and it keeps the fuel vapor sequestered til you're driving so your garage doesn't smell like you have a gasoline leak. The purge valve vacuum actuator is connected to ported vacuum. The big fat vapor purge line is teed into the PCV hose with J30R7 fuel vapor line. It costs you nothing in performance to use one and it keeps SWMBO happy.
There are other GM rigs that use this can but that's the one I know has one.