@Dustin my memory is coming back.
we did spend a fair bit of time sweating the fuel tank.
its a big deal in a rhd conversion.
you cut off half the bottom bulb of the tank lengthwise as part of the firewall mod.
and there is no room left for feeding the plastic overflow pipe (43/1) down the back of the tank. and the hole it exits disappears. so you turn right up high and feed into rhs wheel well. we copied crayfords when we did mine and did this.
and all the hoses were there in crayfords converted car and the expansion tank.
but no charcoal can in a euro spec ROW car.
these were all joined up and exited separately.
but thats not a lhd factory car. thats how crayfords did it.
so my memory is not a reliable indicator of how the factory did it.
and crayfords probably (likely) did something else.
they might have even critiqued the factory design.
i think
@r_towle is probably right.
factory they fed these vents into that clear plastic overflow.
and the overflow is broken in two and is 30 and 29 and its two shorter lengths of plastic with the T. but the PET does not call them out as PVC (clear plastic).
i am a bit suss on that to be honest.
i really think fumes would accumulate.
i will admit fuel vapor is heavier than air so theoretically it should simply descend the tube. also as your driving venturi suction would pull fumes out.
basically 30 and 29 ROW = 43 USA.
thats what
@r_towle is saying.
maybe it worked?
you got to remember Dustin, the euros did not have a closed fuel system at that time.
and most euro cars had a vented fuel cap.
so porsche had a round about way of doing it.
because------the 914 did not have an external fuel cap to vent.
i still think it was suss though. as vapors to me can come up the overflow line and directly into the upper area of front trunk where air box etc are.