zenith carb fuel pipe identification help please

[twin plugged targa]

Here are a couple of (bad) pics of the left fwd end of my zenith carbs which as 2 rubber tubes which seem to go no where?
I can try and get better pics if necc , but is quite hard getting the camera inside the engine bay pointing at the right bit.
Can anyone ID these tubes and advise if they should be routed anywhere or connected?
Thanks in advance
Ben

[PropellerHead]

Those appear to be the fuel vapor canister pressurization and purge lines. One is 'pressurized' by connecting to the fan shroud just behind the alternator (should be a riveted nipple there) and goes to the front of the car to force air through the carbon canister. The second comes back from the canister (look in the trunk) and connects to the airbox I believe which takes the evaporated fuel vapors and ingests/burns them through the engine instead of venting to atomsphere. In your case they may be loose and thus venting fuel vapor into your engine bay.
Do they connect through the fender well on the driver side rear?

[twin plugged targa]

they are not connected at all, hence the concern to their purpose.
I think you are correct that they may be to do witht he fuel vapor cannister as this has been removed as concidered 'not necc' by the mechanic.
I have the fuel tank vented with a simple reinforced pvc hose out under the car.
I guess I may try and extend these hoses further to avoid smell or ignition of gases?

The 3rd hose seen i guess is the main fuel supply from the tank?

Does anyone use the fuel vapor cannisters still?
Are they essential or just advised?
Thanks
Ben

[PropellerHead]

Originally Posted by twin plugged targa

they are not connected at all, hence the concern to their purpose.
I think you are correct that they may be to do witht he fuel vapor cannister as this has been removed as concidered 'not necc' by the mechanic.
I have the fuel tank vented with a simple reinforced pvc hose out under the car.
I guess I may try and extend these hoses further to avoid smell or ignition of gases?

The 3rd hose seen i guess is the main fuel supply from the tank?

Does anyone use the fuel vapor cannisters still?
Are they essential or just advised?
Thanks
Ben

Are they essential......depends on where you live and just how serious you take the US EPA.
Since there is no performance benefit from venting to atmosphere vs. into the induction path, why not vent the evaporative emissions into the engine instead of into the air?
The carbon canister is supposed to absorb fuel vapors from the tank and then 'purge' them into the induction tract for combustion rather than releasing raw hydrocarbons into the atmosphere. It serves the purpose well when in good working order and also is effective at reducting the explosion risk of the fuel vapors. I imagine any long-hood car by now has a substantially reduced effectivity of this system but that doesn't mean it should be simply discarded.

Mine ('71 911T) is in the car and connected as original except that I've changed to a K&N watershield air cleaner set-up instead of the original airbox housing. I've connected the purge line to the crankcase breather line kit.

[rw7810]

I just got rid of all that stuff..... not needed. To include that line and device mounted on the rear of the carb.