I noticed these plumbing lines under the middle bench. What are they

[2nd Hand Yank]

Sorry no pics available yet, (busy) but I can show them later.

I discovered them as I removed the rear bench first on the touring wagon
then I noticed I have the exact same plumbing in my L Series.

There are 4 lines running along the floor, inside the cab,
under the middle bench seat that then bend and run along the passenger side floor.
More specifically, three lines run through one common bulkhead
and there's a smaller fourth one running beside it.

Does this mean my L Series has return fuel lines already installed?
Is my fuel pump electrical, or compatible with the EA82 MPFI engine?

I'd like to swap in the MPFI out of the touring wagon into my L Series which is carby EA82.
If my suspicions are correct, I can just find the return line and connect the MPFI engine.

Thanks

[Gannon]

The pipes you see are for the fuel vapour separator that is located up near the fuel filler, behind the guard. One of the pipes goes to the engine bay and to the charcoal canister and the associated purge valve.

If your car is a carburettored version, the fuel return from the engine bay will be smaller than the supply hose from the pump. In a fuel injected car, the supply and return are both the same size.

[Bantum]

P.S. - One of the smaller line's would be the brake, you just need to follow it to see where it goes ...