hey all, im about to hook up the charcoal canister and just need to check how to connect it to the tank

ive left all the original purge valve untouched as the ECU has a hissy fit and throws error codes if its disconnected
its still connected to the throttle body and ill run the line from it to the canister as per stock with the roll over 1way valve in place, and obviously from the canister the line to the tank using the original VW fuel line as its the same size and currently unused.

now if i understand the system right the breather hose that comes off my stock tank and goes down under the car (green circles) is the one i need to hook to the canister so the tank is no longer venting to the atmosphere without filtering first through the canister

i just dont want to cause my tank to implode by causing a restriction in the breather

does this all sound right??

I've never connected one on a beetle or type 3, only a late bay kombi.
On the kombi, yes the tank breather connects to the small fitting. The kombi has an output from the fan housing to connect to the larger fitting to blow air through th4 charcoal.

Have you serviced th charcol canister, or is it new? They can be pulled apart and re-packed if need be.

Thanks Andy,

its the stock subaru one which is sealed so completely unserviceable

im really only installing it to keep the engineer happy as ive noticed that some conversions especially overseas dont even bother having one
but if its doing a small part to help the enviroment then why not

i havent owned a 75-76 bug that had one but ive seen that there abit different and use the fanhousing to pressurise the canister

Ah, OK.
So I'm guessing from your info Subaru suck air in at the throttle body. That side of it I would guess you need to connect as per stock.
Yes, the line you circled is what VW use as the breather line for the tank., and normally loops over the bonnet and exits underneath.
Would be worth your while to see what effects it makes to see if it's good or not. If there is a one way valve in there, make sure it will not pressurise the tank if the motor is not running.

I removed all that crap the car nows weight about 50 kilos less just vent the tank as per the old days

i removed from the 76 bug it never workd and when i removed ithe tubes were all blocked so out it went

If the engine your putting in had a charcoal canister, then you need to run one - legally speaking. I have one even though my car didn't originally have one.

It has been a while (7 years) so my memory is a bit fuzzy, but I think my canister had 3 pipes. 1 for the tank breather, 1 for the purge solenoid and 1 overflow. On the MX6 the overflow went into the middle of the box section from chassis. The overflow needs to go somewhere that if it overflows the likeihood of it being ignited is as low as possible.

i think nearly everything since the 80s has had them

its the stock canister i pulled out of the liberty
my shitty camera doesnt show it real well but its got 2 spigots large one marked fuel tank and the small one is marked purge. it goes to the purge control solenoid which is connected to the throttle body just upstream of the butterfly
its also got an air breather hole in the bottom of the canister

so from what i can gather as the tank expands the vapours that are normally dumped into the atmosphere go into the canister instead and the air is filtered out the bottom and the vapours are stored in the canister and burned by the engine once the ECU opens the purge valve?

cheers Andrew,

only thing im not sure is whether to run the single breather hose straight to the canister or leave it in place and tee into it
altho to my way of thinking this defeats the purpose abit

I used the original fule line as the breather pipe to tank and the braized a fitting to the filler neck and also used a fuel filter to stop fuel being sucked into the canister (had problems when i 1st did conversion came back to car and fuel was dripping out of canister.

thats preety much what im planning on doing
the stock Lbug breather runs across the edge of the windscreen scuttle so its well above the top the tank so theres no real risk of fuel getting in there unless the car rolls in which there'd be other concerns

i left the standard vw fuel line to use as the tank return from the canister.
just have to find somewhere to mount it now

does anyone know under what actual conditions the ECU opend the purge solenoid?