Fuel Lines 68 cab to a 71 chassis

[magwakeenercew2jh]

Got the motor in the frame today. A couple of notches for the headers. Some questions arose over the fuel tank from the '71 that I'll be using in the '68 cab that has '71 "Everything Else"

I believe the '71 has the EEC fuel tank. It had the vent tube running up the back space behind the passenger in the cab, which I removed and kept, the canister next to the battery box in the engine bay, which I jettisoned, and a mess of fuel lines running from around the fuel pump to the back.

One , in particular, seems strange. It's *outside* the front frame rail and curves up looking to accept a rubber hose (to the cannister?). I think I can figure that there is a feed from the tank (goes back thru the cab floor?), a "return", and a "vent". Is it ba good guess that all three of these hoses go back to the fuel tank and up thru the floor of the cab? The '71 cab (gone to the rust collector/squisher), had two holes in the cab floor, and the '68 has only one.

So, what do I actually need? All three? Which is which? I looked on the explosion on LMC and I can't be sure. I'd really like to just use the supply line and whatever else is ABSOLUTELY necessary. Whatever that would be.

Thanks.

Here's the sparks flying today. The gas is turned off (moved outside) and our eyes and ears are covered.