76 fuel and vapor line info

[RootBeerFXS]

I have a single tank, dual line sender in my truck. All I can find is a dual tank diagram. Where does the smaller, I am assuming, vapor line route to?

[ray_mcavoy]

With a 2-line sending unit, the vent line should be routed to a charcoal vapor recovery canister mounted in the engine compartment. Or, if your truck is over 6000lbs gvw, it would just have a vent cap (like the type used on axles & auto transmissions) installed onto that vent line.