What are these line for?

[Huck]

The 72's has some unique pollution control stuff like a double line going to your fuel pump - one feeds fuel to the pump and the other returns any leakage back to the fuel tank. There is also the third line that goes to the vacumn canister --to suck fumes. In many cases, these lines have been removed over the years due to rust out, rot out, or clogged lines. The factory manuals show these lines in detail so you minght want to invest in a few or trade your rear hatch for some------(:>)